Method for transmitting and receiving physical downlink shared channel in wireless communication system, and apparatus therefor

ABSTRACT

A method of receiving, by a user equipment (UE), a physical downlink shared channel (PDSCH) in a wireless communication system is disclosed. The method comprises receiving configuration information related to the PDSCH, receiving a message representing an activation of a transmission configuration indicator (TCI) state related to the PDSCH, receiving physical downlink control information (DCI) scheduling the PDSCH, and receiving the PDSCH based on the DCI. Specific frequency domains related to the activation are determined based on the message, and the activated TCI states are related to the specific frequency domains.

CROSS-REFERENCE TO RELATED APPLICATIONS

Pursuant to 35 U.S.C. § 119(e) this application is a continuation ofInternational Application No. PCT/KR2020/013521, filed on Oct. 5, 2020,which claims the benefit of U.S. Provisional Application No. 62/910,445,filed on Oct. 3, 2019 and U.S. Provisional Application No. 62/915,699,filed on Oct. 16, 2019, the contents of which are all herebyincorporated by reference herein in their entirety.

TECHNICAL FIELD

The present disclosure relates to a method of transmitting and receivinga physical downlink shared channel in a wireless communication systemand a device therefor.

BACKGROUND ART

Mobile communication systems have been developed to guarantee useractivity while providing voice services. Mobile communication systemsare expanding their services from voice only to data. Current soaringdata traffic is depleting resources and users' demand for higher-datarate services is leading to the need for more advanced mobilecommunication systems.

Next-generation mobile communication systems are required to meet, e.g.,handling of explosively increasing data traffic, significant increase inper-user transmission rate, working with a great number of connectingdevices, and support for very low end-to-end latency and high-energyefficiency. To that end, various research efforts are underway forvarious technologies, such as dual connectivity, massive multiple inputmultiple output (MIMO), in-band full duplex, non-orthogonal multipleaccess (NOMA), super wideband support, and device networking.

SUMMARY

The present disclosure provides a method of transmitting and receiving aphysical downlink shared channel.

Specifically, up to 128 TCI states are configured for the purpose ofreception of the physical downlink shared channel, and up to 8 TCIstates of the configured TCI states are activated. One TCI state of theactivated TCI states is indicated by downlink control informationscheduling the physical downlink shared channel.

According to the existing method, a message for activation of the TCIstate is transmitted per individual CC/BWP. Thus, the existing methodcauses necessarily an overhead of control signaling for the activationof the TCI state when a single beam (e.g., single TCI state information)is commonly applied to configured bands (component carriers and/orbandwidth parts).

The present disclosure provides a method for solving the above-describedproblems.

The technical objects to be achieved by the present disclosure are notlimited to those that have been described hereinabove merely by way ofexample, and other technical objects that are not mentioned can beclearly understood by those skilled in the art, to which the presentdisclosure pertains, from the following descriptions.

In one aspect of the present disclosure, there is provided a method ofreceiving, by a user equipment (UE), a physical downlink shared channel(PDSCH) in a wireless communication system, the method comprisingreceiving configuration information related to the PDSCH, receiving amessage representing an activation of a transmission configurationindicator (TCI) state related to the PDSCH, receiving physical downlinkcontrol information (DCI) scheduling the PDSCH, the DCI representing oneTCI state of TCI states activated by the message, and receiving thePDSCH based on the DCI.

Specific frequency domains related to the activation are determinedbased on the message, and the activated TCI states are related to thespecific frequency domains.

The specific frequency domains are based on at least one of componentcarriers (CCs) or bandwidth parts (BWPs), and the specific frequencydomains are based on a list which is pre-configured via a higher layersignaling.

The message may be based on a medium access control-control element (MACCE).

The pre-configured list may be based on one of a plurality of candidatelists.

The message may represent specific TCI states, and the activated TCIstates may be based on the specific TCI states and may be related to allor some of the specific frequency domains.

Based on TCI states configured in the specific frequency domains fullyoverlapping the specific TCI states, respectively, the specific TCIstates may be activated for the specific frequency domains.

Based on TCI states configured in one frequency domain of the specificfrequency domains partially overlapping the specific TCI states, thespecific TCI states may be activated for a frequency domain related to atransmission of the message among the specific frequency domains.

The message may represent specific TCI states, and the activated TCIstates may be based on all or some of the specific TCI states.

For a frequency domain configured with TCI states including all thespecific TCI states among the specific frequency domains, all thespecific TCI states may be activated.

For a frequency domain configured with TCI states including some of thespecific TCI states among the specific frequency domains, some of thespecific TCI states may be activated.

Based on the activated TCI states being based on some of the specificTCI states, some of the specific TCI states may be mapped to a pluralityof states related to a transmission configuration indication field ofthe DCI based on a pre-configured pattern.

The pre-configured pattern may be a pattern in which some of thespecific TCI states are repeated in a specific order based on a TCIstate ID.

In another aspect of the present disclosure, there is provided a userequipment (UE) receiving a physical downlink shared channel (PDSCH) in awireless communication system, the UE comprising one or moretransceivers, one or more processors configured to control the one ormore transceivers, and one or more memories operably connected to theone or more processors, the one or more memories configured to storeinstructions performing operations based on a reception of the PDSCHbeing performed by the one or more processors.

The operations comprise receiving configuration information related tothe PDSCH, receiving a message representing an activation of atransmission configuration indicator (TCI) state related to the PDSCH,receiving physical downlink control information (DCI) scheduling thePDSCH, the DCI representing one TCI state of TCI states activated by themessage, and receiving the PDSCH based on the DCI,

Specific frequency domains related to the activation are determinedbased on the message, and the activated TCI states are related to thespecific frequency domains.

The specific frequency domains are based on at least one of componentcarriers (CCs) or bandwidth parts (BWPs), and the specific frequencydomains are based on a list which is pre-configured via a higher layersignaling.

In another aspect of the present disclosure, there is provided a devicecomprising one or more memories and one or more processors operativelyconnected to the one or more memories. The one or more processors areconfigured to allow the device to receive configuration informationrelated to a physical downlink shared channel (PDSCH), receive a messagerepresenting an activation of a transmission configuration indicator(TCI) state related to the PDSCH, receive physical downlink controlinformation (DCI) scheduling the PDSCH, and receive the PDSCH based onthe DCI.

The DCI represents one TCI state of TCI states activated by the message.Specific frequency domains related to the activation are determinedbased on the message, and the activated TCI states are related to thespecific frequency domains.

The specific frequency domains are based on at least one of componentcarriers (CCs) or bandwidth parts (BWPs), and the specific frequencydomains are based on a list which is pre-configured via a higher layersignaling.

In another aspect of the present disclosure, there is provided one ormore non-transitory computer readable mediums storing one or moreinstructions, wherein the one or more instructions executable by one ormore processors allow a user equipment (UE) to receive configurationinformation related to a physical downlink shared channel (PDSCH),receive a message representing an activation of a transmissionconfiguration indicator (TCI) state related to the PDSCH, receivephysical downlink control information (DCI) scheduling the PDSCH, andreceive the PDSCH based on the DCI.

The DCI represents one TCI state of TCI states activated by the message.Specific frequency domains related to the activation are determinedbased on the message, and the activated TCI states are related to thespecific frequency domains.

The specific frequency domains are based on at least one of componentcarriers (CCs) or bandwidth parts (BWPs), and the specific frequencydomains are based on a list which is pre-configured via a higher layersignaling.

In another aspect of the present disclosure, there is provided a methodof transmitting, by a base station, a physical downlink shared channel(PDSCH) in a wireless communication system, the method comprisingtransmitting configuration information related to the PDSCH,transmitting a message representing an activation of a transmissionconfiguration indicator (TCI) state related to the PDSCH, transmittingphysical downlink control information (DCI) scheduling the PDSCH, theDCI representing one TCI state of TCI states activated by the message,and transmitting the PDSCH based on the DCI.

Specific frequency domains related to the activation are determinedbased on the message, and the activated TCI states are related to thespecific frequency domains.

The specific frequency domains are based on at least one of componentcarriers (CCs) or bandwidth parts (BWPs), and the specific frequencydomains are based on a list which is pre-configured via a higher layersignaling.

In another aspect of the present disclosure, there is provided a basestation transmitting a physical downlink shared channel (PDSCH) in awireless communication system, the base station comprising one or moretransceivers, one or more processors configured to control the one ormore transceivers, and one or more memories operably connected to theone or more processors, the one or more memories configured to storeinstructions performing operations based on a transmission of the PDSCHbeing performed by the one or more processors.

The operations comprise transmitting configuration information relatedto the PDSCH, transmitting a message representing an activation of atransmission configuration indicator (TCI) state related to the PDSCH,transmitting physical downlink control information (DCI) scheduling thePDSCH, the DCI representing one TCI state of TCI states activated by themessage, and transmitting the PDSCH based on the DCI.

Specific frequency domains related to the activation are determinedbased on the message, and the activated TCI states are related to thespecific frequency domains.

The specific frequency domains are based on at least one of componentcarriers (CCs) or bandwidth parts (BWPs), and the specific frequencydomains are based on a list which is pre-configured via a higher layersignaling.

According to embodiments of the present disclosure, TCI states can beactivated for specific frequency domains based on a list which ispre-configured via higher layer signaling.

Accordingly, since the activation of the TCI states can be equallyapplied to the frequency domains based on the pre-configured list, anoverhead of control signaling related to the activation of the TCIstates can be reduced. Further, a beam can be updated more efficientlythan when a common beam is used for a plurality of frequency domains.

As described above, according to embodiments of the present disclosure,latency and overhead related to a transmission/reception procedure ofthe PDSCH can be reduced.

Effects which may be obtained by the present disclosure are not limitedto the aforementioned effects, and other technical effects not describedabove may be evidently understood by a person having ordinary skill inthe art to which the present disclosure pertains from the followingdescription.

DESCRIPTION OF DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the present disclosure and constitute a part of thedetailed description, illustrate embodiments of the present disclosureand together with the description serve to explain the principle of thepresent disclosure.

FIG. 1 is a diagram illustrating an example of an overall systemstructure of NR to which a method proposed in the present disclosure isapplicable.

FIG. 2 illustrates a relationship between an uplink frame and a downlinkframe in a wireless communication system to which a method proposed bythe present disclosure is applicable.

FIG. 3 illustrates an example of a frame structure in an NR system.

FIG. 4 illustrates an example of a resource grid supported by a wirelesscommunication system to which a method proposed in the presentdisclosure is applicable.

FIG. 5 illustrates examples of a resource grid for each antenna port andnumerology to which a method proposed in the present disclosure isapplicable.

FIG. 6 illustrates physical channels and general signal transmissionused in a 3GPP system.

FIG. 7 illustrates an example of beamforming using SSB and CSI-RS.

FIGS. 8A and 8B illustrate an example of a UL BM procedure using an SRS.

FIG. 9 illustrates an example of downlink transmission/receptionoperation.

FIG. 10 illustrates an MAC CE related to TCI state activation to which amethod described in the present disclosure is applicable.

FIG. 11 illustrates an MAC CE message for TCI stateactivation/deactivation to which a method described in the presentdisclosure is applicable.

FIG. 12 illustrates an MAC CE according to an embodiment of the presentdisclosure.

FIG. 13 illustrates an example of signaling between a UE and a basestation to which a method described in the present disclosure isapplicable.

FIG. 14 is a flow chart illustrating a method of receiving, by a UE, aphysical downlink shared channel in a wireless communication systemaccording to an embodiment of the present disclosure.

FIG. 15 is a flow chart illustrating a method of transmitting, by a basestation, a physical downlink shared channel in a wireless communicationsystem according to another embodiment of the present disclosure.

FIG. 16 illustrates a communication system 1 applied to the presentdisclosure.

FIG. 17 illustrates wireless devices applicable to the presentdisclosure.

FIG. 18 illustrates a signal process circuit for a transmission signal.

FIG. 19 illustrates another example of a wireless device applied to thepresent disclosure.

FIG. 20 illustrates a hand-held device applied to the presentdisclosure.

DETAILED DESCRIPTION

Hereinafter, preferred embodiments of the disclosure are described indetail with reference to the accompanying drawings. The followingdetailed description taken in conjunction with the accompanying drawingsis intended for describing example embodiments of the disclosure, butnot for representing a sole embodiment of the disclosure. The detaileddescription below includes specific details to convey a thoroughunderstanding of the disclosure. However, it will be easily appreciatedby one of ordinary skill in the art that embodiments of the disclosuremay be practiced even without such details.

In some cases, to avoid ambiguity in concept, known structures ordevices may be omitted or be shown in block diagrams while focusing oncore features of each structure and device.

Hereinafter, downlink (DL) means communication from a base station to aterminal and uplink (UL) means communication from the terminal to thebase station. In the downlink, a transmitter may be part of the basestation, and a receiver may be part of the terminal. In the uplink, thetransmitter may be part of the terminal and the receiver may be part ofthe base station. The base station may be expressed as a firstcommunication device and the terminal may be expressed as a secondcommunication device. A base station (BS) may be replaced with termsincluding a fixed station, a Node B, an evolved-NodeB (eNB), a NextGeneration NodeB (gNB), a base transceiver system (BTS), an access point(AP), a network (5G network), an AI system, a road side unit (RSU), avehicle, a robot, an Unmanned Aerial Vehicle (UAV), an Augmented Reality(AR) device, a Virtual Reality (VR) device, and the like. Further, theterminal may be fixed or mobile and may be replaced with terms includinga User Equipment (UE), a Mobile Station (MS), a user terminal (UT), aMobile Subscriber Station (MSS), a Subscriber Station (SS), an AdvancedMobile Station (AMS), a Wireless Terminal (WT), a Machine-TypeCommunication (MTC) device, a Machine-to-Machine (M2M) device, and aDevice-to-Device (D2D) device, the vehicle, the robot, an AI module, theUnmanned Aerial Vehicle (UAV), the Augmented Reality (AR) device, theVirtual Reality (VR) device, and the like.

The following technology may be used in various wireless access systems,such as code division multiple access (CDMA), frequency divisionmultiple access (FDMA), time division multiple access (TDMA), orthogonalfrequency division multiple access (OFDMA), single carrier-FDMA(SC-FDMA), non-orthogonal multiple access (NOMA), and the like. The CDMAmay be implemented by radio technology such as universal terrestrialradio access (UTRA) or CDMA2000. The TDMA may be implemented by radiotechnology such as global system for mobile communications (GSM)/generalpacket radio service (GPRS)/enhanced data rates for GSM evolution(EDGE). The OFDMA may be implemented as radio technology such as IEEE802.11(Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA),and the like. The UTRA is a part of a universal mobile telecommunicationsystem (UMTS). 3rd generation partnership project (3GPP) long termevolution (LTE), as a part of an evolved UMTS (E-UMTS) using E-UTRA,adopts the OFDMA in the downlink and the SC-FDMA in the uplink. LTE-A(advanced) is the evolution of 3GPP LTE.

For clarity of description, the present disclosure is described based onthe 3GPP communication system (e.g., LTE-A or NR), but the technicalspirit of the present disclosure are not limited thereto. LTE meanstechnology after 3GPP TS 36.xxx Release 8. In detail, LTE technologyafter 3GPP TS 36.xxx Release 10 is referred to as the LTE-A and LTEtechnology after 3GPP TS 36.xxx Release 13 is referred to as the LTE-Apro. The 3GPP NR means technology after TS 38.xxx Release 15. The LTE/NRmay be referred to as a 3GPP system. “xxx” means a standard documentdetail number. The LTE/NR may be collectively referred to as the 3GPPsystem. Matters disclosed in a standard document published before thepresent disclosure may refer to a background art, terms, abbreviations,etc., used for describing the present disclosure. For example, thefollowing documents may be referenced.

3GPP LTE

36.211: Physical channels and modulation

36.212: Multiplexing and channel coding

36.213: Physical layer procedures

36.300: Overall description

36.331: Radio Resource Control (RRC)

3GPP NR

38.211: Physical channels and modulation

38.212: Multiplexing and channel coding

38.213: Physical layer procedures for control

38.214: Physical layer procedures for data

38.300: NR and NG-RAN Overall Description

36.331: Radio Resource Control (RRC) protocol specification

As more and more communication devices require larger communicationcapacity, there is a need for improved mobile broadband communicationcompared to the existing radio access technology (RAT). Further, massivemachine type communications (MTCs), which provide various servicesanytime and anywhere by connecting many devices and objects, are one ofthe major issues to be considered in the next generation communication.In addition, a communication system design considering a service/UEsensitive to reliability and latency is being discussed. As such, theintroduction of next-generation radio access technology consideringenhanced mobile broadband communication (eMBB), massive MTC (mMTC),ultra-reliable and low latency communication (URLLC) is discussed, andin the present disclosure, the technology is called NR for convenience.The NR is an expression representing an example of 5G radio accesstechnology (RAT).

Three major requirement areas of 5G include (1) an enhanced mobilebroadband (eMBB) area, (2) a massive machine type communication (mMTC)area and (3) a ULtra-reliable and low latency communications (URLLC)area.

Some use cases may require multiple areas for optimization, and otheruse case may be focused on only one key performance indicator (KPI). 5Gsupport such various use cases in a flexible and reliable manner.

eMBB is far above basic mobile Internet access and covers media andentertainment applications in abundant bidirectional tasks, cloud oraugmented reality. Data is one of key motive powers of 5G, and dedicatedvoice services may not be first seen in the 5G era. In 5G, it isexpected that voice will be processed as an application program using adata connection simply provided by a communication system. Major causesfor an increased traffic volume include an increase in the content sizeand an increase in the number of applications that require a high datatransfer rate. Streaming service (audio and video), dialogue type videoand mobile Internet connections will be used more widely as more devicesare connected to the Internet. Such many application programs requireconnectivity always turned on in order to push real-time information andnotification to a user. A cloud storage and application suddenlyincreases in the mobile communication platform, and this may be appliedto both business and entertainment. Furthermore, cloud storage is aspecial use case that tows the growth of an uplink data transfer rate.5G is also used for remote business of cloud. When a tactile interfaceis used, further lower end-to-end latency is required to maintainexcellent user experiences. Entertainment, for example, cloud game andvideo streaming are other key elements which increase a need for themobile broadband ability. Entertainment is essential in the smartphoneand tablet anywhere including high mobility environments, such as atrain, a vehicle and an airplane. Another use case is augmented realityand information search for entertainment. In this case, augmentedreality requires very low latency and an instant amount of data.

Furthermore, one of the most expected 5G use case relates to a functioncapable of smoothly connecting embedded sensors in all fields, that is,mMTC. Until 2020, it is expected that potential IoT devices will reach20.4 billions. The industry IoT is one of areas in which 5G performsmajor roles enabling smart city, asset tracking, smart utility,agriculture and security infra.

URLLC includes a new service which will change the industry throughremote control of major infra and a link having ultra reliability/lowavailable latency, such as a self-driving vehicle. A level ofreliability and latency is essential for smart grid control, industryautomation, robot engineering, drone control and adjustment.

Multiple use cases are described more specifically.

5G may supplement fiber-to-the-home (FTTH) and cable-based broadband (orDOCSIS) as means for providing a stream evaluated from gigabits persecond to several hundreds of mega bits per second. Such fast speed isnecessary to deliver TV with resolution of 4K or more (6K, 8K or more)in addition to virtual reality and augmented reality. Virtual reality(VR) and augmented reality (AR) applications include immersive sportsgames. A specific application program may require a special networkconfiguration. For example, in the case of VR game, in order for gamecompanies to minimize latency, a core server may need to be integratedwith the edge network server of a network operator.

An automotive is expected to be an important and new motive power in 5G,along with many use cases for the mobile communication of an automotive.For example, entertainment for a passenger requires a high capacity anda high mobility mobile broadband at the same time. The reason for thisis that future users continue to expect a high-quality connectionregardless of their location and speed. Another use example of theautomotive field is an augmented reality dashboard. The augmentedreality dashboard overlaps and displays information, identifying anobject in the dark and notifying a driver of the distance and movementof the object, over a thing seen by the driver through a front window.In the future, a wireless module enables communication betweenautomotives, information exchange between an automotive and a supportedinfrastructure, and information exchange between an automotive and otherconnected devices (e.g., devices accompanied by a pedestrian). A safetysystem guides alternative courses of a behavior so that a driver maydrive more safely, thereby reducing a danger of an accident. A next stepwill be a remotely controlled or self-driven vehicle. This requires veryreliable, very fast communication between different self-driven vehiclesand between an automotive and infra. In the future, a self-drivenvehicle may perform all driving activities, and a driver will be focusedon things other than traffic, which cannot be identified by anautomotive itself. Technical requirements of a self-driven vehiclerequire ultra-low latency and ultra-high speed reliability so thattraffic safety is increased up to a level which cannot be achieved by aperson.

A smart city and smart home mentioned as a smart society will beembedded as a high-density radio sensor network. The distributed networkof intelligent sensors will identify the cost of a city or home and acondition for energy-efficient maintenance. A similar configuration maybe performed for each home. All of a temperature sensor, a window andheating controller, a burglar alarm and home appliances are wirelesslyconnected. Many of such sensors are typically a low data transfer rate,low energy and a low cost. However, for example, real-time HD video maybe required for a specific type of device for surveillance.

The consumption and distribution of energy including heat or gas arehighly distributed and thus require automated control of a distributedsensor network. A smart grid collects information, and interconnectssuch sensors using digital information and a communication technology sothat the sensors operate based on the information. The information mayinclude the behaviors of a supplier and consumer, and thus the smartgrid may improve the distribution of fuel, such as electricity, in anefficient, reliable, economical, production-sustainable and automatedmanner. The smart grid may be considered to be another sensor networkhaving small latency.

A health part owns many application programs which reap the benefits ofmobile communication. A communication system may support remotetreatment providing clinical treatment at a distant place. This helps toreduce a barrier for the distance and may improve access to medicalservices which are not continuously used at remote farming areas.Furthermore, this is used to save life in important treatment and anemergency condition. A radio sensor network based on mobilecommunication may provide remote monitoring and sensors for parameters,such as the heart rate and blood pressure.

Radio and mobile communication becomes increasingly important in theindustry application field. Wiring requires a high installation andmaintenance cost. Accordingly, the possibility that a cable will bereplaced with reconfigurable radio links is an attractive opportunity inmany industrial fields. However, to achieve the possibility requiresthat a radio connection operates with latency, reliability and capacitysimilar to those of the cable and that management is simplified. Lowlatency and a low error probability is a new requirement for aconnection to 5G.

Logistics and freight tracking is an important use case for mobilecommunication, which enables the tracking inventory and packagesanywhere using a location-based information system. The logistics andfreight tracking use case typically requires a low data speed, but awide area and reliable location information.

In a New RAT system including NR uses an OFDM transmission scheme or asimilar transmission scheme thereto. The new RAT system may follow OFDMparameters different from OFDM parameters of LTE. Alternatively, the newRAT system may follow numerology of conventional LTE/LTE-A as it is orhave a larger system bandwidth (e.g., 100 MHz). Alternatively, one cellmay support a plurality of numerologies. In other words, UEs thatoperate with different numerologies may coexist in one cell.

The numerology corresponds to one subcarrier spacing in a frequencydomain. By scaling a reference subcarrier spacing by an integer N,different numerologies may be defined.

Definition of Terms

eLTE eNB: The eLTE eNB is the evolution of eNB that supportsconnectivity to EPC and NGC.

gNB: A node which supports the NR as well as connectivity to NGC.

New RAN: A radio access network which supports either NR or E-UTRA orinterfaces with the NGC.

Network slice: A network slice is a network defined by the operatorcustomized to provide an optimized solution for a specific marketscenario which demands specific requirements with end-to-end scope.

Network function: A network function is a logical node within a networkinfrastructure that has well-defined external interfaces andwell-defined functional behavior.

NG-C: A control plane interface used at an NG2 reference point betweennew RAN and NGC.

NG-U: A user plane interface used at an NG3 reference point between newRAN and NGC.

Non-standalone NR: A deployment configuration where the gNB requires anLTE eNB as an anchor for control plane connectivity to EPC, or requiresan eLTE eNB as an anchor for control plane connectivity to NGC.

Non-standalone E-UTRA: A deployment configuration where the eLTE eNBrequires a gNB as an anchor for control plane connectivity to NGC.

User plane gateway: An end point of NG-U interface.

Overview of System

FIG. 1 illustrates an example overall NR system structure to which amethod as proposed in the disclosure may apply.

Referring to FIG. 1, an NG-RAN is constituted of gNBs to provide acontrol plane (RRC) protocol end for user equipment (UE) and NG-RA userplane (new AS sublayer/PDCP/RLC/MAC/PHY).

The gNBs are mutually connected via an Xn interface.

The gNBs are connected to the NGC via the NG interface.

More specifically, the gNB connects to the access and mobilitymanagement function (AMF) via the N2 interface and connects to the userplane function (UPF) via the N3 interface.

New RAT (NR) Numerology and Frame Structure

In the NR system, a number of numerologies may be supported. Here, thenumerology may be defined by the subcarrier spacing and cyclic prefix(CP) overhead. At this time, multiple subcarrier spacings may be derivedby scaling the basic subcarrier spacing by integer N (or, μ). Further,although it is assumed that a very low subcarrier spacing is not used ata very high carrier frequency, the numerology used may be selectedindependently from the frequency band.

Further, in the NR system, various frame structures according tomultiple numerologies may be supported.

Hereinafter, an orthogonal frequency division multiplexing (OFDM)numerology and frame structure that may be considered in the NR systemis described.

The multiple OFDM numerologies supported in the NR system may be definedas shown in Table 1.

TABLE 1 μ Δf = 2^(μ) · 15[kHz] Cyclic prefix 0 15 Normal 1 30 Normal 260 Normal, Extended 3 120 Normal 4 240 Normal

NR supports multiple numerologies (or subcarrier spacings (SCS)) forsupporting various 5G services. For example, if SCS is 15 kHz, NRsupports a wide area in typical cellular bands. If SCS is 30 kHz/60 kHz,NR supports a dense urban, lower latency and a wider carrier bandwidth.If SCS is 60 kHz or higher, NR supports a bandwidth greater than 24.25GHz in order to overcome phase noise.

An NR frequency band is defined as a frequency range of two types FR1and FR2. The FR1 and the FR2 may be configured as in Table 1 below.Furthermore, the FR2 may mean a millimeter wave (mmW).

TABLE 2 Frequency Range Corresponding frequency designation rangeSubcarrier Spacing FR1  410 MHz-7125 MHz 15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

With regard to the frame structure in the NR system, the size of variousfields in the time domain is expressed as a multiple of time unit ofT_(s)=1/(Δf_(max)·N_(f)), where Δf_(max)=480·10³, and N_(f)=4096.Downlink and uplink transmissions is constituted of a radio frame with aperiod of T_(f)=(Δf_(max)N_(f)/100)·T_(s)=10 ms. Here, the radio frameis constituted of 10 subframes each of which has a period ofT_(sf)=(Δf_(max)N_(f)/100)·T_(s)=1 ms. In this case, one set of framesfor uplink and one set of frames for downlink may exist.

FIG. 2 illustrates a relationship between an uplink frame and downlinkframe in a wireless communication system to which a method described inthe present disclosure is applicable.

As illustrated in FIG. 2, uplink frame number i for transmission fromthe user equipment (UE) should begin T_(TA)=N_(TA)T_(s) earlier than thestart of the downlink frame by the UE.

For numerology μ, slots are numbered in ascending order of n_(s)^(μ)∈{0, . . . , N_(subframe) ^(slotμ)−1} in the subframe and inascending order of n_(s,f) ^(μ)∈{0, . . . , N_(subframe) ^(slotμ)−1}.One slot includes consecutive OFDM symbols of N_(symb) ^(μ), andN_(symb) ^(μ) is determined according to the used numerology and slotconfiguration. In the subframe, the start of slot n_(s) ^(μ) istemporally aligned with the start of n_(s) ^(μ)N_(symb) ^(μ).

Not all UEs are able to transmit and receive at the same time, and thismeans that not all OFDM symbols in a downlink slot or an uplink slot areavailable to be used.

Table 3 represents the number N_(symb) ^(slot) of OFDM symbols per slot,the number N_(slot) ^(frame,μ), of slots per radio frame, and the numberN_(slot) ^(subframe,μ) of slots per subframe in a normal CP. Table 4represents the number of OFDM symbols per slot, the number of slots perradio frame, and the number of slots per subframe in an extended CP.

TABLE 3 μ N_(symb) ^(slot) N_(slot) ^(frame,μ) N_(slot) ^(subframe,μ) 014 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

TABLE 4 μ N_(symb) ^(slot) N_(slot) ^(frame,μ) N_(slot) ^(subframe,μ) 212 40 4

FIG. 3 illustrates an example of a frame structure in a NR system. FIG.3 is merely for convenience of explanation and does not limit the scopeof the present disclosure.

In Table 4, in case of μ=2, i.e., as an example in which a subcarrierspacing (SCS) is 60 kHz, one subframe (or frame) may include four slotswith reference to Table 3, and one subframe={1, 2, 4} slots shown inFIG. 3, for example, the number of slot(s) that may be included in onesubframe may be defined as in Table 3.

Further, a mini-slot may consist of 2, 4, or 7 symbols, or may consistof more symbols or less symbols.

In regard to physical resources in the NR system, an antenna port, aresource grid, a resource element, a resource block, a carrier part,etc. May be considered.

Hereinafter, the above physical resources that may be considered in theNR system are described in more detail.

First, in regard to an antenna port, the antenna port is defined so thata channel over which a symbol on an antenna port is conveyed may beinferred from a channel over which another symbol on the same antennaport is conveyed. When large-scale properties of a channel over which asymbol on one antenna port is conveyed may be inferred from a channelover which a symbol on another antenna port is conveyed, the two antennaports may be regarded as being in a quasi co-located or quasico-location (QC/QCL) relation. Here, the large-scale properties mayinclude at least one of delay spread, Doppler spread, frequency shift,average received power, and received timing.

FIG. 4 illustrates an example of a resource grid supported in a wirelesscommunication system to which a method proposed in the presentdisclosure is applicable.

Referring to FIG. 4, a resource grid consists of N_(RB) ^(μ)N_(sc) ^(RB)subcarriers on a frequency domain, each subframe consisting of 14·2μOFDM symbols, but the present disclosure is not limited thereto.

In the NR system, a transmitted signal is described by one or moreresource grids, consisting of N_(RB) ^(μ)N_(sc) ^(RB) subcarriers, and2^(μ)N_(symb) ^((μ)) OFDM symbols, where N_(RB) ^(μ)≤N_(RB) ^(max,μ).N_(RB) ^(max,μ) denotes a maximum transmission bandwidth and may changenot only between numerologies but also between uplink and downlink.

In this case, as illustrated in FIG. 5, one resource grid may beconfigured per numerology μ and antenna port p.

FIG. 5 illustrates examples of a resource grid per antenna port andnumerology to which a method proposed in the present disclosure isapplicable.

Each element of the resource grid for the numerology μ and the antennaport p is called a resource element and is uniquely identified by anindex pair (k,l), where k=0, . . . , N_(RB) ^(μ)N_(sc) ^(RB)−1 is anindex on a frequency domain, and l=0, . . . , 2^(μ)N_(symb) ^((μ))−1 toa location of a symbol in a subframe. The index pair (k,l) is used torefer to a resource element in a slot, where l=0, . . . , N_(symb)^((μ))−1.

The resource element (k,l) for the numerology μ and the antenna port pcorresponds to a complex value a_(k,l) ^((p,μ)). When there is no riskfor confusion or when a specific antenna port or numerology is notspecified, the indexes p and μ may be dropped, and as a result, thecomplex value may be a_(k,l) ^((p)) or a_(k,l) .

Further, a physical resource block is defined as N_(sc) ^(RB)=12consecutive subcarriers in the frequency domain.

Point A serves as a common reference point of a resource block grid andmay be obtained as follows.

-   -   offsetToPointA for PCell downlink represents a frequency offset        between the point A and a lowest subcarrier of a lowest resource        block that overlaps a SS/PBCH block used by the UE for initial        cell selection, and is expressed in units of resource blocks        assuming 15 kHz subcarrier spacing for FR1 and 60 kHz subcarrier        spacing for FR2;    -   absoluteFrequencyPointA represents frequency-location of the        point A expressed as in absolute radio-frequency channel number        (ARFCN).

The common resource blocks are numbered from 0 and upwards in thefrequency domain for subcarrier spacing configuration μ.

The center of subcarrier 0 of common resource block 0 for the subcarrierspacing configuration μ coincides with ‘point A’. A common resourceblock number n_(CRB) ^(μ) in the frequency domain and resource elements(k, l) for the subcarrier spacing configuration μ may be given by thefollowing Equation 1.

$\begin{matrix}{n_{CRB}^{\mu} = \lfloor \frac{k}{N_{sc}^{RB}} \rfloor} & \lbrack {{Equation}\mspace{14mu} 1} \rbrack\end{matrix}$

Here, k may be defined relative to the point A so that k=0 correspondsto a subcarrier centered around the point A. Physical resource blocksare defined within a bandwidth part (BWP) and are numbered from 0 toN_(BWP,i) ^(size)−1, where i is No. Of the BWP. A relation between thephysical resource block n_(PRB) in BWP i and the common resource blockn_(CRB) may be given by the following Equation 2.

n _(CRB) =n _(PRB) +N _(BWP,i) ^(start)  [Equation 2]

Here, N_(BWP,i) ^(start) may be the common resource block where the BWPstarts relative to the common resource block 0.

Physical Channel and General Signal Transmission

FIG. 6 illustrates physical channels and general signal transmissionused in a 3GPP system. In a wireless communication system, the UEreceives information from the eNB through Downlink (DL) and the UEtransmits information from the eNB through Uplink (UL). The informationwhich the eNB and the UE transmit and receive includes data and variouscontrol information and there are various physical channels according toa type/use of the information which the eNB and the UE transmit andreceive.

When the UE is powered on or newly enters a cell, the UE performs aninitial cell search operation such as synchronizing with the eNB (S601).To this end, the UE may receive a Primary Synchronization Signal (PSS)and a (Secondary Synchronization Signal (SSS) from the eNB andsynchronize with the eNB and acquire information such as a cell ID orthe like. Thereafter, the UE may receive a Physical Broadcast Channel(PBCH) from the eNB and acquire in-cell broadcast information.Meanwhile, the UE receives a Downlink Reference Signal (DL RS) in aninitial cell search step to check a downlink channel status.

A UE that completes the initial cell search receives a Physical DownlinkControl Channel (PDCCH) and a Physical Downlink Control Channel (PDSCH)according to information loaded on the PDCCH to acquire more specificsystem information (S602).

When there is no radio resource first accessing the eNB or for signaltransmission, the UE may perform a Random Access Procedure (RACH) to theeNB (S603 to S606). To this end, the UE may transmit a specific sequenceto a preamble through a Physical Random Access Channel (PRACH) (S603 andS605) and receive a response message (Random Access Response (RAR)message) for the preamble through the PDCCH and a corresponding PDSCH.In the case of a contention based RACH, a Contention ResolutionProcedure may be additionally performed (S606).

The UE that performs the above procedure may then perform PDCCH/PDSCHreception (S607) and Physical Uplink Shared Channel (PUSCH)/PhysicalUplink Control Channel (PUCCH) transmission (S608) as a generaluplink/downlink signal transmission procedure. In particular, the UE mayreceive Downlink Control Information (DCI) through the PDCCH. Here, theDCI may include control information such as resource allocationinformation for the UE and formats may be differently applied accordingto a use purpose.

The control information which the UE transmits to the eNB through theuplink or the UE receives from the eNB may include a downlink/uplinkACK/NACK signal, a Channel Quality Indicator (CQI), a Precoding MatrixIndex (PMI), a Rank Indicator (RI), and the like. The UE may transmitthe control information such as the CQI/PMI/RI, etc., through the PUSCHand/or PUCCH.

Beam Management (BM)

A BM procedure as layer 1 (L1)/layer 2 (L2) procedures for acquiring andmaintaining a set of base station (e.g., gNB, TRP, etc.) and/or terminal(e.g., UE) beams which may be used for downlink (DL) and uplink (UL)transmission/reception may include the following procedures and terms.

-   -   Beam measurement: Operation of measuring characteristics of a        beam forming signal received by the eNB or UE.    -   Beam determination: Operation of selecting a transmit (Tx)        beam/receive (Rx) beam of the eNB or UE by the eNB or UE.    -   Beam sweeping: Operation of covering a spatial region using the        transmit and/or receive beam for a time interval by a        predetermined scheme.    -   Beam report: Operation in which the UE reports information of a        beamformed signal based on beam measurement.

The BM procedure may be divided into (1) a DL BM procedure using asynchronization signal (SS)/physical broadcast channel (PBCH) Block orCSI-RS and (2) a UL BM procedure using a sounding reference signal(SRS). Further, each BM procedure may include Tx beam sweeping fordetermining the Tx beam and Rx beam sweeping for determining the Rxbeam.

Downlink Beam Management (DL BM)

The DL BM procedure may include (1) transmission of beamformed DLreference signals (RSs) (e.g., CIS-RS or SS Block (SSB)) of the eNB and(2) beam reporting of the UE.

Here, the beam reporting a preferred DL RS identifier (ID)(s) andL1-Reference Signal Received Power (RSRP).

The DL RS ID may be an SSB Resource Indicator (SSBRI) or a CSI-RSResource Indicator (CRI).

FIG. 7 illustrates an example of beamforming using a SSB and a CSI-RS.

As illustrated in FIG. 7, a SSB beam and a CSI-RS beam may be used forbeam measurement. A measurement metric is L1-RSRP per resource/block.The SSB may be used for coarse beam measurement, and the CSI-RS may beused for fine beam measurement. The SSB may be used for both Tx beamsweeping and Rx beam sweeping. The Rx beam sweeping using the SSB may beperformed while the UE changes Rx beam for the same SSBRI acrossmultiple SSB bursts. One SS burst includes one or more SSBs, and one SSburst set includes one or more SSB bursts.

DL BM Related Beam Indication

A UE may be RRC-configured with a list of up to M candidate transmissionconfiguration indication (TCI) states at least for the purpose of quasico-location (QCL) indication, where M may be 64.

Each TCI state may be configured with one RS set. Each ID of DL RS atleast for the purpose of spatial QCL (QCL Type D) in an RS set may referto one of DL RS types such as SSB, P-CSI RS, SP-CSI RS, A-CSI RS, etc.

Initialization/update of the ID of DL RS(s) in the RS set used at leastfor the purpose of spatial QCL may be performed at least via explicitsignaling.

Table 5 represents an example of TCI-State IE.

The TCI-State IE associates one or two DL reference signals (RSs) withcorresponding quasi co-location (QCL) types.

TABLE 5 -- ASN1START -- TAG-TCI-STATE-START TCI-State ::=  SEQUENCE { tci-StateId   TCI-StateId,  qcl-Type1  QCL-Info,  qcl-Type2  QCL-Info ... } QCL-Info ::= SEQUENCE {  cell   ServCellIndex  bwp-Id   BWP-Id referenceSignal   CHOICE {   csi-rs   NZP-CSI-RS-ResourceId,   ssb   SSB-Index  },  qcl-Type  ENUMERATED {typeA, typeB,  ...  typeC,typeD}, } -- TAG-TCI-STATE-STOP -- ASN1STOP

In Table 5, bwp-Id parameter represents a DL BWP where the RS islocated, cell parameter represents a carrier where the RS is located,and reference signal parameter represents reference antenna port(s)which is a source of quasi co-location for corresponding target antennaport(s) or a reference signal including the one. The target antennaport(s) may be CSI-RS, PDCCH DMRS, or PDSCH DMRS. As an example, inorder to indicate QCL reference RS information on NZP CSI-RS, thecorresponding TCI state ID may be indicated to NZP CSI-RS resourceconfiguration information. As another example, in order to indicate QCLreference information on PDCCH DMRS antenna port(s), the TCI state IDmay be indicated to each CORESET configuration. As another example, inorder to indicate QCL reference information on PDSCH DMRS antennaport(s), the TCI state ID may be indicated via DCI.

Quasi-Co Location (QCL)

The antenna port is defined so that a channel over which a symbol on anantenna port is conveyed may be inferred from a channel over whichanother symbol on the same antenna port is conveyed. When properties ofa channel over which a symbol on one antenna port is conveyed may beinferred from a channel over which a symbol on another antenna port isconveyed, the two antenna ports may be considered as being in a quasico-located or quasi co-location (QC/QCL) relationship.

The channel properties include one or more of delay spread, Dopplerspread, frequency/Doppler shift, average received power, receivedtiming/average delay, and spatial RX parameter. The spatial Rx parametermeans a spatial (reception) channel property parameter such as an angleof arrival.

The UE may be configured with a list of up to M TCI-State configurationswithin the higher layer parameter PDSCH-Config to decode PDSCH accordingto a detected PDCCH with DCI intended for the corresponding UE and agiven serving cell, where M depends on UE capability.

Each TCI-State contains parameters for configuring a quasi co-locationrelationship between one or two DL reference signals and the DM-RS portsof the PDSCH.

The quasi co-location relationship is configured by the higher layerparameter qcl-Type1 for the first DL RS and qcl-Type2 for the second DLRS (if configured). For the case of two DL RSs, the QCL types are not bethe same, regardless of whether the references are to the same DL RS ordifferent DL RSs.

The quasi co-location types corresponding to each DL RS are given by thehigher layer parameter qcl-Type of QCL-Info and may take one of thefollowing values:

-   -   ‘QCL-TypeA’: {Doppler shift, Doppler spread, average delay,        delay spread}    -   ‘QCL-TypeB’: {Doppler shift, Doppler spread}    -   ‘QCL-TypeC’: {Doppler shift, average delay}    -   ‘QCL-TypeD’: {Spatial Rx parameter}

For example, if a target antenna port is a specific NZP CSI-RS, thecorresponding NZP CSI-RS antenna ports may be indicated/configured to beQCLed with a specific TRS in terms of QCL-TypeA and with a specific SSBin terms of QCL-TypeD. The UE receiving the indication/configuration mayreceive the corresponding NZP CSI-RS using the Doppler or delay valuemeasured in the QCL-TypeA TRS and apply the Rx beam used for QCL-TypeDSSB reception to the reception of the corresponding NZP CSI-RSreception.

The UE may receive an activation command by MAC CE signaling used to mapup to eight TCI states to the codepoint of the DCI field ‘TransmissionConfiguration Indication’.

UL BM Procedure

A UL BM may be configured such that beam reciprocity (or beamcorrespondence) between Tx beam and Rx beam is established or notestablished depending on the UE implementation. If the beam reciprocitybetween Tx beam and Rx beam is established in both a base station and aUE, a UL beam pair may be adjusted via a DL beam pair. However, if thebeam reciprocity between Tx beam and Rx beam is not established in anyone of the base station and the UE, a process for determining the ULbeam pair is necessary separately from determining the DL beam pair.

Even when both the base station and the UE maintain the beamcorrespondence, the base station may use a UL BM procedure fordetermining the DL Tx beam even if the UE does not request a report of a(preferred) beam.

The UM BM may be performed via beamformed UL SRS transmission, andwhether to apply UL BM of a SRS resource set is configured by the(higher layer parameter) usage. If the usage is set to ‘BeamManagement(BM)’, only one SRS resource may be transmitted to each of a pluralityof SRS resource sets in a given time instant.

The UE may be configured with one or more sounding reference symbol(SRS) resource sets configured by (higher layer parameter)SRS-ResourceSet (via higher layer signaling, RRC signaling, etc.). Foreach SRS resource set, the UE may be configured with K≥1 SRS resources(higher later parameter SRS-resource), where K is a natural number, anda maximum value of K is indicated by SRS_capability.

In the same manner as the DL BM, the UL BM procedure may be divided intoa UE's Tx beam sweeping and a base station's Rx beam sweeping.

FIGS. 8A and 8B illustrate an example of a UL BM procedure using a SRS.

More specifically, FIG. 8A illustrates an Rx beam determinationprocedure of a base station, and FIG. 8B illustrates a Tx beam sweepingprocedure of a UE.

FIG. 9 illustrates an example of downlink transmission/receptionoperation.

A base station may schedule downlink transmission such as frequency/timeresources, a transport layer, a downlink precoder, MCS, and the like(S910). As an example, the base station may determine a beam fortransmitting a PDSCH to a UE.

The UE may receive downlink control information (DCI: Downlink ControlInformation) for downlink scheduling (i.e., including schedulinginformation of the PDSCH) on a PDCCH from the base station (S920).

DCI format 1_0 or DCI format 1_1 may be used for downlink scheduling,and DCI format 1_1 may include the following information. For example,DCI format 1_1 may include at least one of a DCI format identifier, abandwidth part indicator, frequency domain resource assignment, timedomain resource assignment, a PRB bundling size indicator, a ratematching indicator, ZP CSI-RS trigger, antenna port(s), transmissionconfiguration indication (TCI), an SRS request, and demodulationreference signal (DMRS) sequence initialization.

In particular, the number of DMRS ports can be scheduled, and SU(single-user)/MU (multi-user) transmission scheduling can be performedaccording to each state indicated in the antenna port(s) field.

In addition, the TCI field consists of 3 bits, and the QCL for the DMRSmay be dynamically indicated by indicating a maximum of 8 TCI statesaccording to the TCI field value.

The UE may receive downlink data from the base station on the PDSCH(S930).

When the UE detects a PDCCH including DCI format 1_0 or 1_1, the UE maydecode the PDSCH according to an indication by the corresponding DCI.Here, when the UE receives a PDSCH scheduled by DCI format 1, the UE mayset a DMRS configuration type by a higher layer parameter ‘dmrs-Type’,and the DMRS type is used to receive the PDSCH. In addition, the UE mayset the maximum number of DMRS symbols front-loaded for the PDSCH by ahigher layer parameter ‘maxLength’.

In the case of DMRS configuration type 1, when a single codeword isscheduled for the UE and an antenna port mapped with an index of {2, 9,10, 11 or 30} is specified, or two codewords are scheduled for the UE,the UE assumes that all remaining orthogonal antenna ports are notassociated with PDSCH transmission to another UE. In the case of DMRSconfiguration type 2, if a single codeword is scheduled for the UE andan antenna port mapped with an index of {2, 10 or 23} is specified, orif two codewords are scheduled for the UE, the UE assumes that all theremaining orthogonal antenna ports are not associated with PDSCHtransmission to another UE.

When the UE receives the PDSCH, it may assume precoding granularity P′to be consecutive resource blocks in the frequency domain. Here, P′ maycorrespond to one of {2, 4, broadband}. If P′ is determined to bewideband, the UE does not expect to be scheduled with non-contiguousPRBs and the UE may assume that the same precoding is applied toallocated resources. On the other hand, if P′ is determined as any oneof {2, 4}, a precoding resource block group (PRG) is divided into P′consecutive PRBs. The actual number of consecutive PRBs in each PRG maybe one or more. The UE may assume that the same precoding is applied toconsecutive downlink PRBs in the PRG.

In order for the UE to determine a modulation order, a target code rate,and a transport block size in the PDSCH, the UE may first read a 5-bitMCD field in the DCI and determine the modulation order and the targetcode rate. Then, the UE may read a redundancy version field in the DCIand determine a redundancy version. In addition, the UE may determinethe transport block size using the number of layers and the total numberof allocated PRBs before rate matching.

The contents (3GPP system, frame structure, NR system, etc.) describedabove can be applied by being combined with methods to be describedlater in the present disclosure, or can be supplemented to clarifytechnical features of methods described in the present disclosure.Methods to be described below are distinguished merely for convenienceof description. Therefore, it is obvious that partial configuration ofany one method can be replaced by partial configuration of anothermethod, or methods can be combined and applied.

In a current scheme in which up to 128 RRC-configurable candidate TCIstates (as a candidate pool) are RRC-configurable per CC/BWP, 8 TCIstates among them are activated (down-selected) by MAC CE and are mappedto ‘Transmission Configuration Indication’ of DCI, and then one of the 8TCI states is dynamically indicated upon the subsequent PDSCHscheduling, the up to 128 RRC-configured candidate TCI states areindependently RRC-configured per individual CC and per specific BWPwithin the individual CC as described above, and a subsequent MAC CEactivation message is also sent per individual CC and per specific BWPwithin the individual CC. For example, even in the case of a system(so-called “one beam system”) that intends to commonly apply only asingle beam (or single TCI state information) for all the configuredCCs/BWPs, there is a disadvantage in that the same controlling messageshould be unnecessarily repeatedly transmitted across multipleconfigured CCs/BWPs. According to the current Rel-15 NR CA standard,since the UE can be configured with up to 32 CCs, the above situationmay be seen as having a very large unnecessary control signalingoverhead.

The contents (3GPP system, frame structure, NB-IoT system, etc.)described above can be applied by being combined with methods to bedescribed later in the present disclosure, or can be supplemented toclarify technical features of methods described in the presentdisclosure.

First, through the following operation in the current MAC standard (3GPPTS 38.321), there is supported a feature in which up to 8 TCI states inan RRC-configurable TCI-state pool (up to 128 TCI states) per bandwidthpart (BWP) per component carrier (CC) are mapped to ‘TransmissionConfiguration Indication’ of DL DCI through MAC-CE based activation, andone of the up to 8 TCI states is dynamically selected (i.e., dynamicTCI/beam selection for PDSCH) upon the subsequent DCI-based DLscheduling.

With reference to FIG. 10, matters related to activation/deactivation ofa transmission configuration indicator (TCI) state are described below.

FIG. 10 illustrates an MAC CE related to TCI state activation to which amethod described in the present disclosure is applicable.

The TCI state activation/deactivation for UE-specific PDSCH MAC CE isidentified by a MAC PDU subheader with a specified logical channel ID(LCID). With reference to FIG. 10, the UE-specific PDSCH MAC CE has avariable size consisting of following fields.

-   -   Serving Cell ID: This field indicates the ID of the serving cell        for which the MAC CE applies. The length of the field is 5 bits.    -   BWP ID: This field indicates a DL BWP for which the MAC CE        applies as the codepoint of the DCI bandwidth part indicator        field. The length of the BWP ID field is 2 bits.    -   Ti: If there is a TCI state in which an ID of the TCI state is i        (i.e., with TCI-StateId i), this field indicates the        activation/deactivation status of the TCI state with TCI-StateId        otherwise (if there is no TCI state with TCI-StateId i) MAC        entity shall ignore the T_(i) field.

The T_(i) field is set to “1” to indicate that the TCI state withTCI-StateId i is activated and mapped to the codepoint of the DCITransmission Configuration Indication field. The T_(i) field is set to“0” to indicate that the TCI state with TCI-StateId i is deactivated andis not mapped to the codepoint of the DCI Transmission ConfigurationIndication field. The codepoint to which the TCI state is mapped isdetermined by its ordinal position among all the TCI states with T_(i)field set to “1”. That is, the first TCI state with T_(i) field set to“1” is mapped to the codepoint value 0. The second TCI State with T_(i)field set to “1” is mapped to the codepoint value 1. The maximum numberof activated TCI states is 8.

-   -   R: Reserved bit, set to “0”.

As described above, the application of up to 8 TCI states activated byMAC-CE signaling may be based on the Transmission ConfigurationIndication field of DL DCI. An operation related to the TCI field of theDL DCI may be performed based on the Quasi-Co Location (QCL) relatedcontents and DCI format 1_1. This is described in detail below.

The UE may be configured with a list of up to M TCI-State configurationswithin the higher layer parameter PDSCH-Config to decode PDSCH accordingto a detected PDCCH with DCI intended for the UE and the given servingcell, where M depends on the UE capability.

Each TCI-State contains parameters for configuring a quasi co-locationrelationship between one or two DL reference signals and the DM-RS portsof the PDSCH.

Each TCI-State contains parameters for configuring a quasi co-location(QCL) relationship between one or two DL reference signals and the DM-RSports of the PDSCH, the DM-RS port of PDCCH or the CSI-RS port of aCSI-RS resource. The quasi co-location relationship is configured by thehigher layer parameter qcl-Type1 for the first DL RS and qcl-Type2 forthe second DL RS (if configured). For the case of two DL RSs, the QCLtypes are not the same, regardless of whether the references are to thesame DL RS or different DL RSs.

The quasi co-location types corresponding to each DL RS are given by thehigher layer parameter qcl-Type in QCL-Info and may take one of thefollowing values:

-   -   ‘QCL-TypeA’: {Doppler shift, Doppler spread, average delay,        delay spread}    -   ‘QCL-TypeB’: {Doppler shift, Doppler spread}    -   ‘QCL-TypeC’: {Doppler shift, average delay}    -   ‘QCL-TypeD’: {Spatial Rx parameter}

The UE receives an activation command used to map up to 8 TCI states tothe codepoints of the DCI field ‘Transmission Configuration Indication’.When the HARQ-ACK corresponding to the PDSCH carrying the activationcommand is transmitted in slot n, the (indicated) mapping between TCIstates and codepoints of the DCI field ‘Transmission ConfigurationIndication’ should be applied starting from the first slot that is afterslot n+3N_(slot) ^(subframe,μ).

After a UE receives an initial higher layer configuration of TCI statesand before reception of the activation command, the UE may assume thatthe DM-RS ports of PDSCH of a serving cell are quasi co-located with theSS/PBCH block determined in the initial access procedure with respect toQCL-TypeA′ (when applicable, also with respect to ‘QCL-TypeD’).

Matters related to DCI format 1_1 is described below.

DCI format 1_1 is used for the scheduling of PDSCH in one cell.

DCI foramt 1_1 includes a field (transmission configuration indicationfield) for indicating any one of the activated TCI states.

-   -   Transmission configuration indication: 0 bit if higher layer        parameter tci-PresentInDCI is not enabled; otherwise (if higher        layer parameter tci-PresentInDCI is enabled) 3 bits.

The UE may operate as follows in relation to the transmissionconfiguration indication (TCI) field.

1) If the “Bandwidth part indicator” field indicates a bandwidth partother than the active bandwidth part,

2) if the higher layer parameter tci-PresentInDCI is not enabled for thecontrol resource set (CORESET) used for the PDCCH carrying the DCIformat 1_1,

3) the UE assumes tci-PresentInDCI is not enabled for all CORESETs inthe indicated bandwidth part.

2) otherwise (i.e., if the higher layer parameter tci-PresentInDCI isenabled for the control resource set (CORESET) used for the PDCCHcarrying the DCI format 1_1),

3) the UE assumes tci-PresentInDCI is enabled for all CORESETs in theindicated bandwidth part.

An operation related to the TCI state activation based on the existingmethod as above is performed as follows.

Up to 128 candidate TCI states as a candidate pool are configurable percomponent carrier (CC)/bandwidth part (BWP). The configuration may beperformed via RRC.

8 TCI states among them are activated (down-selected) by MAC CE and aremapped to a ‘Transmission Configuration Indication’ field of DCI.Afterward, one of the activated TCI states is dynamically indicated uponthe subsequent PDSCH scheduling.

According to the existing method as above, the configuration of the upto 128 (RRC-configured) candidate TCI states is independently configuredper individual CC (and per specific BWP within the individual CC) (viaRRC), and a subsequent MAC CE activation message is also sent perindividual CC (and per specific BWP within the individual CC).

However, the existing method has the following problem.

Specifically, for example, in the case of a system (so-called “one beamsystem”) in which only one beam (or one TCI state information) iscommonly managed (applied) for all the configured CCs/BWPs, the samecontrolling message should be unnecessarily repeatedly transmittedacross multiple configured CCs/BWPs. That is, the existing method has adisadvantage in that the same controlling message should beunnecessarily repeatedly transmitted.

Since the UE can be configured with up to 32 component carriers (CCs),the UE may cause a very large unnecessary control signaling overhead ifthe TCI states are activated according to the existing method.

To solve the above problem, the following details have been agreed inrelation to a basic operation to enable simultaneously/at once/commonlythe activations of up to 8 MAC-CE-activated TCI-states for PDSCH formultiple CCs/BWPs via a single MAC CE message.

The following agreement is related to simultaneous TCI statesactivation/selection across multiple CCs/BWPs.

For latency/overhead reduction across multiple CCs/BWPs, a method ofsupporting single MAC-CE to activate the same set of PDSCH TCI state IDsfor multiple CCs/BWPs may be considered.

Example 1: Through the reuse of Rel-15 MAC-CE, the same set of TCI stateIDs for all active BWPs in same band or cell group on FR2 may beactivated.

Support of this mode can be indicated by UE capability.

To operate in this mode, the UE expects that the same QCL-TypeD RS isconfigured for the same TCI state ID for all active BWPs in each band orcell group(s).

For activation MAC-CE received on any active BWP in a band or cellgroup(s), indicated activated TCI state IDs are applied to all activeBWPs in the corresponding band or cell group(s).

Example 2: Through the reuse of Rel-15 MAC-CE, one set of TCI state IDs(including both QCL Type-A and QCL Type-D RSs) for an active BWP of theCC indicated by the MAC-CE may be activated. The MAC-CE is applied toall active BWPs in the same band or cell group on FR2.

Note: The QCL Type A RS(s) applied to each CC/BWP is that correspondingto the same resource ID(s) indicated by the TCI state IDs. That is, theQCL Type A RS(s) applied to each CC/BWP may be indicated by the resourceID(s).

There is a need to determine operation/signaling details including thepossibility to activate different sets of PDSCH TCI state IDs formultiple CCs/BWPs.

Note: QCL type-A comes from the BWP where the TCI state is applied.

As described above, it is agreed to support a single MAC-CE can activateat least the same set of PDSCH TCI state IDs for multiple CCs/BWPs forlatency/overhead reduction across multiple CCs/BWPs.

The Examples 1 and 2 are similar, and the main difference considered inthe Example 2 is based on the linkage with the same ID criterion todetermine QCL Type-A RS.

That is, according to the current standard, source/reference of QCLType-D (for spatial QCL) attribute configurable for a specific target RSwithin a specific BWP supports to be able apply “cross-CC/BWP QCLassociation/signaling” from different CCs/BWPs. However,source/reference of QCL Type-A or Type-B or Type-C attributeconfigurable for the specific target RS within the specific BWP cannotapply “cross-CC/BWP QCL association/signaling” from different CCs/BWPs,and only a specific RS within the BWP configured with only the target RSmay be source/reference.

The present disclosure proposes the following operation.

It would be more preferable if the single MAC CE message can carry aflexible combination of CCs/BWPs by allowing a simple concatenation ofthe applied list of CCs/BWPs inside the MAC CE message. This canachieves huge overhead reduction compared to the existing MAC CE messageformat that only carries (TCI state activation related to) one CC/BWP ata time delivered by a separate PDSCH.

Since the Examples 1 and 2 can be regarded as a special case of thesuggested concatenation based method, the suggested concatenation basedmethod seems sufficient and more desired in terms of the flexibility andoverhead reduction trade-off

[Proposal 1]

As described above, considering the flexibility and overhead reductiontrade-off, a concatenation of the applied list of CCs/BWPs inside theMAC CE message may be considered to activate the same set of PDSCH TCIstate IDs.

As an embodiment of the proposed operation, the following structure maybe considered.

For the simultaneous TCI states activation for PDSCH, the concatenatedCCs/BWPs commonly applied by a single MAC CE message may be considered.This is described below with reference to FIG. 11.

FIG. 11 illustrates an MAC CE message for TCI stateactivation/deactivation to which a method described in the presentdisclosure is applicable. More specifically, FIG. 11 illustrates aUE-specific PDSCH MAC CE.

Referring to FIG. 11, a base station may signal a list of M CCs (andBWPs according to the M CCs) in a concatenated form. The M value may beindicated together via the MAC CE message. For example, a separatebitwidth for signaling of the M value is configured, and if this valueis first decoded, list information of subsequent M CCs (and BWPsaccording to the M CCs) may be decoded.

As another method, as illustrated in FIG. 11, ‘R’ (Reserved bit) of 1bit may be present in front of a part indicating each CC ID and BWP ID,and the base station may inform a UE of information related to the Mvalue in a kind of “toggling” form using this. For example, 1) if ‘R’=1,it may be defined as a flag notifying a state in which a next row (forCC ID and BWP ID) is also present, and an operation for continuouslydecoding next CC ID and BWP ID information may be applied. 2) If a valueof ‘R’ existing in front of any specific row (for CC ID and BWP ID) issignaled as ‘R’=0, an operation may be defined/configured so that thespecific row (for CC ID and BWP ID) is recognized to correspond to alast row of the concatenated CCs/BWPs list.

As another example, the M value may be provided via separate RRC (and/orMAC CE) configuration. In other words, the base station may configure,to the UE, a list of M CCs (and BWPs according to the M CCs) related tothe simultaneous TCI state activation via RRC signaling.

It should be appreciated that various modifications that allow the Mvalue (i.e., M CCs/BWPs list) to be recognized through theabove-described embodiments are included in the spirit of the presentdisclosure.

In this instance, the TCI states based on the list of M CCs/BWPs may beactivated (by the MAC CE message) based on the following i) or ii).

i) In the MAC CE message, a part (or field) indicatingactivation/deactivation of each TCI state subsequent to concatenatedCCs/BWPs part to apply the MAC CE message may be based on the existingformat. That is, the TCI states related to the activation/deactivationmay be expressed as ‘T0, T1, . . . , T(N−2)×8+7’ in the MAC CE message.‘(N−2)×8+7’ may be based on higher layer parameter‘maxNrofTCI-States-1’. That is, the same set of TCI states activated forthe concatenated CCs/BWPs may be commonly applied.

ii) In the MAC CE message, a part (or field) indicatingactivation/deactivation of each TCI state (e.g., T0, T1, T(N−2)×8+7described above) may not indicate single information (the same set ofTCI states described above). Specifically, the part (or field)indicating activation/deactivation of each TCI state may includeinformation related to activation/deactivation of independent/differentTCI states (pre-defined/pre-configured) per applied CCs/BWPs (or per asubset of applied CCs/BWPs). As above, (the existing field inside) theMAC CE message may be extended and applied. For example, the MAC CEmessage may include as much TCI state activation/deactivation relatedinformation as the number of concatenated CCs/BWPs to be configured viathe MAC CE message.

And/or, the concatenated CCs/BWPs may be configured based on thefollowing restriction. Specifically, the concatenated CCs/BWPs(serving-cell IDs) may be configured based on a restriction to be basedon a combination of only intra-band CCs. This is to prevent the same setof TCI states from being commonly activated since a frequency spacinggreatly increases between CCs beyond intra-band (i.e., inter-band CCs).

Through the above-described proposal, there is an effect of flexiblydesignating CCs/BWPs to which the simultaneous TCI states activation isapplied. And/or, to efficiently designate the CCs/BWPs to be applied, apre-defined/pre-configured list of CCs/BWPs may be separatelyconfigured/designated and applied.

[Proposal 1-1]

A base station may configure n candidate CCs/BWPs for CCs/BWPs foractivation/deactivation of TCI states and indicate one CC/BWP among then configured candidate CCs/BWPs.

Specifically, the base station may pre-configure combinations ofCCs/BWPs (or sets of CCs/BWPs) for the purpose of TCI statesactivation/deactivation as n candidates (e.g., combination 0 tocombination n−1, or set 0 to set n−1) via separate RRC signalling.

The base station may indicate one combination of CCs/BWPs via a specificbit field of a (single) MAC CE message. The specific bit field (X bitfield) may indicate one combination of CCs/BWPs among the n configuredcandidates. For example, X may be based on log₂n. More specifically, Xmay be one of 1, 2, 3, 4, 5, 6, 7 or 8.

A method of performing simultaneous TCI states activation/deactivationfor the combination of CCs/BWPs may be considered. That is, the onecombination of CCs/BWPs may include list information of the M CCs(and/or corresponding BWPs) described above, and a network (basestation) may indicate the M CCs (and/or corresponding BWPs) via the Xbit field without the need to list the M CCs (and/or corresponding BWPs)on the MAC CE message and may update the TCI states.

Such an operation has advantages of reducing an overhead of the MAC CEmessage and considering flexibility by pre-configuring the ncombinations of CCs/BWPs.

For example, it may be assumed that the number of possible combinationsis 8 (i.e., n=8). First, the base station may pre-configure the 8combinations of CCs/BWPs (or sets of CCs/BWPs) (e.g., combination index0 to combination index 7, or set 0 to set 7) via RRC signalling.Afterwards, the base station may construct MAC signaling in the form ofincluding 3 bit field (i.e., log₂8 bit field) and a part (or field)indicating activation/deactivation of each TCI state) (e.g., T0, T1,T(N−2)×8+7 of the existing standard) in the (single) MAC CE message. Thebase station may indicate a specific combination of CCs/BWPs(combination index and/or set index) of the 8 combinations via the(single) MAC CE message and may perform the TCI statesactivation/deactivation. For example, the MAC-CE may be configured asillustrated in FIG. 12. FIG. 12 illustrates an MAC CE according to anembodiment of the present disclosure. Referring to FIG. 12, acombination ID field may indicate one combination of CCs/BWPs of the nconfigured combinations of CCs/BWPs.

The combination of CCs/BWPs may consist of CCs/BWPs in the same band orintra-band, or may consist of inter-band CCs/BWPs.

The combination may consist of only CCs, or consist of only BWPs. Forexample, i combinations consist of CCs, and the base station can performTCI States Activation/Deactivation for one combination of CCs among thei combinations through Y bit field (e.g., Y=log₂i/Y is one of 1, 2, 3,4, 5, 6, 7 and 8) and a part (or field) indicating TCI stateactivation/deactivation via the (single) MAC CE message.

If a specific combination is indicated as the case in which acombination consists of only CCs, the UE may operate as follows.

The UE may perform i) TCI States Activation/Deactivation for all BWPs inthe CCs of the combination, or ii) TCI States Activation/Deactivationfor only active BWPs in the CCs of the combination.

Alternatively, the base station may RRC-configure a combinationincluding both the CCs/BWPs in the same manner as the n combinations,and then indicate TCI States Activation/Deactivation for one combinationof CCs/BWPs among the n combinations through Z bit field (e.g.,Z=log₂n/Z is one of 1, 2, 3, 4, 5, 6, 7 and 8) and a part (or field)indicating TCI state activation/deactivation in the (single) MAC CEmessage.

In relation to the MAC CE configuration in the proposal 1-1, in additionto a field related to the combination ID (e.g., combination ID field ofFIG. 12), the MAC CE message may also be configured to additionallyinclude W bit (e.g., W=1, i.e., flag bit) indicating (in the togglingform) whether or not the MAC CE message is for the simultaneous TCIStates Activation/Deactivation.

For example, in addition to a combination ID field of Oct 1 of FIG. 12,the MAC CE message may additionally include information (e.g., 1 bitfield) representing/indicating whether it relates to TCI states updatefor a single CC/BWP or simultaneous TCI states update for multipleCCs/BWPs. The information may be positioned at the MSB or LSB side ofthe Oct 1. That is, the information and the combination ID field may beconfigured to be included in the Oct 1 together, and the information maybe positioned at the MSB/LSB side.

The following needs to be clearly determined in relation to theabove-described embodiments and functions. Specifically, there is a needto clearly determine whether the RRC configurable number of TCI states(up to 128) is still different and independent across the consideredCCs/BWPs.

Proposal 2 is described in detail below.

[Proposal 2]

It would be unnecessarily restrictive if the RRC-configurable number ofTCI states per CCs/BWPs shall also be the same. The main motivation ofthe simultaneous TCI state activation feature is to significantly reduceredundant higher layer signalling overhead. It can be attainable for apart of RRC-configured TCI state IDs which are the common part of thewhole considered CCs/BWPs for the simultaneous TCI state activation. Ifthe indication of activated TCI state IDs is not fully belonging to sucha common part, this indication should only be applied for the targetCC/BWP as a default behaviour. That the indication is not fullybelonging to the common part may mean that all the indicated TCI stateIDs are not included in the common part. In other words, that theindication is not fully belonging to the common part may mean that thecommon part does not include the indicated TCI state IDs or includesonly some of the indicated TCI state IDs.

A behavior according to the proposal 2 is described in detail below.

For example, in a state where TCI states for CC1, CC2 and CC3 (BWPsaccording to the CCs) are configured via RRC as below, the behavioraccording to the proposal 2 may be performed as follows.

For CC1, 100 TCI states are configured (TCI-state ID #1 to TCI-state ID#100)

For CC2, 50 TCI states are configured (TCI-state ID #1 to TCI-state ID#50)

For CC3, 100 TCI states are configured (TCI-state ID #1 to TCI-state ID#100)

In this case, a common part for CC1, CC2 and CC3 is TCI-state ID #1 toTCI-state ID #50.

Example 1) If the MAC CE message (single MAC CE message) is transmittedfrom CC1 and thus a set of indicated TCI-states is TCI state IDs #42,#44, #46, #48, #52, #54, #56, and #58, (simultaneous) TCI stateactivation may be applied only to CC1. This is because the set ofindicated TCI-states does not fully overlap configured TCI-state IDs ofCC2. That is, since all the indicated TCI-states (42, 44, 46, 48, 52,54, 56, and 58) are not included in the common part (TCI state IDs #1 to#50), TCI state activation via the MAC CE message is applied only toCC1.

Example 2) If the MAC CE message (single MAC CE message) is transmittedfrom the CC1 and thus a set of indicated TCI-states is TCI state IDs#12, #14, #16, #18, #22, #24, #26, and #28, (simultaneous) TCI stateactivation may be applied to all the CC1, CC2 and CC3. This is becausethe set of indicated TCI-states fully overlaps configured TCI-state IDsof CC1, CC2 and CC3. That is, since all the indicated TCI-states (12,14, 16, 18, 22, 24, 26, and 28) are included in the common part (TCIstate IDs #1 to #50), TCI state activation via the MAC CE message can beapplied to CC2 and CC3 as well as CC1.

As another method described in the present disclosure, simultaneous TCIstate activation may be performed only for (a set of) CCs/BWPs meetingconditions of the common part. Specifically, in the same case as theExample 1), (simultaneous) TCI state activation may be applied to CC3 aswell as CC1. Although the indicated TCI state IDs (#42, 44, 46, 48, 52,54, 56, and 58) do not fully overlap configured TCI state IDs of CC2,CC1 and CC3 fully overlap TCI state IDs (#1 to 100) configured on theCC1 and CC3. The CC1 and CC3 meet the conditions of the common part.Accordingly, it may be defined/configured/indicated that (simultaneous)TCI state activation is limitedly applied only for a set of CCs/BWPsmeeting the conditions of the common part.

That is, according to the above-described proposed operation, a range ofCCs/BWPs to which activation of (a set of) TCI states indicated by theMAC CE message is applied may be limited as follows.

The activation of (a set of) the indicated TCI states may be applied forCCs/BWPs in which TCI state IDs (RRC-configured TCI states IDs)configured on the CC includes all of a set of the indicated TCI stateIDs.

In addition, for example, CCs/BWPs to which the activation of (a set of)the indicated TCI states is applied may be previously stipulated (e.g.,via separate RRC signalling, etc.) (e.g., CCs/BWPs in an intra-bandand/or in cell group(s)), and the above-described operation may beperformed for CCs/BWPs meeting the above conditions within thepre-stipulated/pre-configured CCs/BWPs.

[Proposal 3]

In the same case as the Example 1), simultaneous TCI state activationmay be performed in a range in which a set of TCI state IDs indicatedper each CC/BWP overlap.

Specifically, if the MAC CE message (single MAC CE message) istransmitted from CC1 and thus a set of indicated TCI-states is TCI stateIDs #42, #44, #46, #48, #52, #54, #56, and #58, (simultaneous) TCIstates activation may be fully applied only to CC1 and CC3, and may beapplied for overlapping TCI-state IDs (i.e., IDs #42, 44, 46, and 48) inCC2.

That is, TCI state IDs configured on CC2 may not include all the set ofindicated TCI-states (#ID 42, 44, 46, 48, 52, 54, 56, and 58), but theTCI states may be activated in the overlapping/including range (#ID 42,44, 46, and 48).

In the above case, only TCI-state IDs #42, 44, 46, and 48 in CC2 may beactivated via the MAC CE message and may be mapped to a ‘TransmissionConfiguration Indication’ field of DL DCI for PDSCH.

And/or, a process of mapping the “TCI-state IDs #42, 44, 46, and 48” toa state indicated by the ‘Transmission Configuration Indication’ field(of a fixed bit-width) may be based on a specific rule/pattern. The“TCI-state IDs #42, 44, 46, and 48” may be sequentially/cyclicallymapped to each state indicated by the TCI field of DL DCI based on thespecific rule/pattern.

For example, in the case of 3-bit ‘Transmission ConfigurationIndication’ field, the “TCI-state IDs #42, 44, 46, and 48” to be mappedmay be sequentially mapped per each field state in ascending order (ordescending order). If there is more field state to be mapped, theprocess of repeatedly mapping the TCI-state IDs may be performed again.The corresponding operation is illustrated as follows.

For the CC2, TCI-state (#IDs 42, 44, 46, 48) may be mapped to states(000′ to ‘111’) indicated by the 3-bit Transmission ConfigurationIndication field as follows.

‘000’: TCI state ID #42

‘001’: TCI-state ID #44

‘010’: TCI-state ID #46

‘011’: TCI-state ID #48

‘100’: TCI-state ID #42

‘101’: TCI-state ID #44

‘110’: TCI-state ID #46

‘111’: TCI-state ID #48

For the CC1 and the CC3, TCI-state (#IDs 42, 44, 46, 48, 52, 54, 56, 58)may be mapped to states (‘000’ to ‘111’) indicated by the 3-bitTransmission Configuration Indication field as follows.

‘000’: TCI state ID #42

‘001’: TCI-state ID #44

‘010’: TCI-state ID #46

‘011’: TCI-state ID #48

‘100’: TCI-state ID #52

‘101’: TCI-state ID #54

‘110’: TCI-state ID #56

‘111’: TCI-state ID #58

The UE operation related to the above-described embodiments may beperformed in the following order.

The capability reporting including the matters related to the UEcapability on “supporting a single MAC-CE to activate at least the sameset of PDSCH TCI state IDs for multiple CCs/BWPs”

-   -   the UE is configured with the RRC-configured candidate TCI        states from the base station    -   the UE receives, from the base station, the proposed MAC CE        message (enhanced MAC-CE signalling with concatenated CCs/BWPs        to be commonly applied for simultaneous TCI states activation        for PDSCH)    -   the UE determines simultaneous TCI states activation based on        the TCI-state ID if a set of TCI-states activated per multiple        CCs/BWPs are differently configured    -   e.g.: if TCI-state IDs are fully overlapped, simultaneous TCI        states activation is applied    -   e.g.: if TCI-state IDs are partially overlapped, it is applied        to overlapped TCI-state ID    -   the UE maps it to ‘Transmission Configuration Indication’ field        of DL-related DCI    -   the UE applies dynamically indicated TCI state among them upon        subsequent PDSCH scheduling and receives PDSCH

The BS operation related to the above-described embodiments may beperformed in the following order.

The base station receives the capability reporting including the mattersrelated to the UE capability on “supporting a single MAC-CE to activateat least the same set of PDSCH TCI state IDs for multiple CCs/BWPs”

-   -   the base station configures the RRC-configured candidate TCI        states to the UE    -   the base station transmits, to the UE, the proposed MAC CE        message (enhanced MAC-CE signalling with concatenated CCs/BWPs        to be commonly applied for simultaneous TCI states activation        for PDSCH)    -   the base station prepares subsequent DL scheduling in a state of        mapping TCI states indicated via the MAC CE message to        ‘Transmission Configuration Indication’ of DL-related DCI    -   the base station applies dynamically indicated TCI state among        them upon subsequent PDSCH scheduling to assume that the UE will        receive PDSCH and transmits the generated PDSCH to the UE

If a communication device to which the above-described embodiment isapplied is the UE, the following operation may be performed.

A processor may perform the capability reporting including the mattersrelated to the UE capability on “supporting a single MAC-CE to activateat least the same set of PDSCH TCI state IDs for multiple CCs/BWPs” onthe base station through a transceiver. The processor may be configuredwith the RRC-configured candidate TCI states from the base stationthrough the transceiver.

The processor may receive the proposed MAC CE message (enhanced MAC-CEsignalling with concatenated CCs/BWPs to be commonly applied forsimultaneous TCI states activation for PDSCH) from the base stationthrough the transceiver.

The processor may map TCI states activated based on the MAC CE messageto ‘Transmission Configuration Indication’ of DL-related DCI.

The processor may apply dynamically indicated TCI state among them uponsubsequent PDSCH scheduling and receive PDSCH from the base stationthrough the transceiver.

If a communication device to which the above-described embodiment isapplied is the base station, the following operation may be performed.

A processor may receive the capability reporting including the mattersrelated to the UE capability on “supporting a single MAC-CE to activateat least the same set of PDSCH TCI state IDs for multiple CCs/BWPs” fromthe UE through a transceiver.

The processor may configure the RRC-configured candidate TCI states tothe UE through the transceiver.

The processor may transmit the proposed MAC CE message (enhanced MAC-CEsignalling with concatenated CCs/BWPs to be commonly applied forsimultaneous TCI states activation for PDSCH) to the UE through thetransceiver.

The processor may prepare subsequent DL scheduling in a state of mappingTCI states via the MAC CE message to ‘Transmission ConfigurationIndication’ of DL-related DCI.

The processor may apply dynamically indicated TCI state among them uponsubsequent PDSCH scheduling to assume that the UE will receive PDSCH andtransmit the generated PDSCH to the UE through the transceiver.

In terms of implementation, the UE/BS operations according to theabove-described embodiments (e.g., operations related to TCI stateactivation based on at least one of the proposal 1, the proposal 1-1,the proposal 2, and the proposal 3) may be processed by a device ofFIGS. 16 to 20 to be described later (e.g., processors 102 and 202 ofFIG. 17).

In addition, the UE/BS operations according to the above-describedembodiments (e.g., operations related to TCI state activation based onat least one of the proposal 1, the proposal 1-1, the proposal 2, andthe proposal 3) may be stored in a memory (e.g., 104 and 204 of FIG. 17)in the form of a command/program (e.g., instruction, executable code)for running at least one processor (e.g., 102 and 202 of FIG. 17).

FIG. 13 illustrates an example of signaling between a UE and a basestation to which a method described in the present disclosure isapplicable. More specifically, FIG. 13 illustrates an example ofsignaling between a base station (BS) and a user equipment (UE) forperforming DL transmission/reception across multiple CCs/BWPs to whichmethods (e.g., the proposal 1/proposal 1-1/proposal 2/proposal 3, etc.)described in the present disclosure are applicable.

In the present disclosure, the UE/BS are merely an example and may bereplaced by various devices to be described below with reference toFIGS. 16 to 20. FIG. 13 is merely for convenience of description anddoes not limit a scope of the present disclosure. Further, some step(s)illustrated in FIG. 13 may be omitted depending on situation and/orsetting, etc.

UE Operation

A UE may transmit UE capability information to a BS, in S1310. Forexample, the UE may transmit, to the BS, the UE capability informationrelated to the above-described proposed methods (e.g., the proposal1/proposal 1-1/proposal 2/proposal 3, etc.). As an example, the UEcapability information may include information related to whether anMAC-CE for TCI state activation/deactivation is supported. As anexample, the UE capability information may include informationfor/related to the number of combinations of CCs/BWPs (or sets ofCCs/BWPs) that the UE can support. As an example, the MAC-CE maycorrespond to a (single) MAC-CE for activating the same set of PDSCH TCIstate IDs for multiple CCs/BWPs.

For example, an operation of the UE (100/200 of FIGS. 16 to 20) in thestep S1310 to transmit the UE capability information to the BS (100/200of FIGS. 16 to 20) may be implemented by a device of FIGS. 16 to 20 tobe described below. For example, referring to FIG. 17, one or moreprocessors 102 may control one or more transceivers 106 and/or one ormore memories 104 so as to transmit the UE capability information, andthe one or more transceivers 106 may transmit the UE capabilityinformation to the BS.

The UE may receive RRC configuration information from the BS, in S1320.The RRC configuration information may include configuration informationrelated to TCI state(s)/DL (e.g., PDSCH/PDCCH, etc.) transmissionrelated configuration information, etc. The RRC configurationinformation may include one or multiple configurations and may betransmitted via UE-specific RRC signaling. For example, the RRCconfiguration information may include RRC configuration, etc. describedin the above-described proposed methods (e.g., the proposal 1/proposal1-1/proposal 2/proposal 3, etc.). As an example, the RRC configurationinformation may include information related to candidate TCI states. Forexample, the candidate TCI states may be differently configured perCC/BWP. As an example, the RRC configuration information may includeinformation for/related to candidates of combination (or set) ofCCs/BWPs related to (simultaneous) TCI states Activation/Deactivation(e.g., list information for the combination (or set) of CCs/BWPs).

For example, an operation of the UE (100/200 of FIGS. 16 to 20) in thestep S1320 to receive the RRC configuration information from the BS(100/200 of FIGS. 16 to 20) may be implemented by the device of FIGS. 16to 20 to be described below. For example, referring to FIG. 17, one ormore processors 102 may control one or more transceivers 106 and/or oneor more memories 104 so as to receive the RRC configuration information,and the one or more transceivers 106 may receive the RRC configurationinformation from the BS.

The UE may receive an MAC-CE from the BS, in S1330. For example, theMAC-CE may include indication information, etc. described in theabove-described proposed methods (e.g., the proposal 1/proposal1-1/proposal 2/proposal 3, etc.). As an example, information forconcatenation of the multiple CCs/BWPs may be received via the MAC-CE.For example, TCI state activation may be simultaneously performed on themultiple CCs/BWPs to which the concatenation is applied. As an example,the MAC-CE may include information related to the TCI state activation.For example, the TCI state activation may vary per CC/BWP. For example,if simultaneous TCI states activation is performed for the multipleCCs/BWPs, the UE may operate considering an activated TCI state ID ineach CC/BWP. As an example, the MAC-CE may include a specific bit field(e.g., X=log₂n, where X is one of 1, 2, 3, 4, 5, 6, 7, and 8) indicatingany one combination (or set) of CCs/BWPs among candidates of combination(or set) of CCs/BWPs configured via the RRC configuration information.For example, the MAC-CE may additionally include informationrepresenting/indicating whether the MAC-CE is related to TCI statesupdate for a single CC/BWP or simultaneous TCI states update for themultiple CCs/BWPs, in addition to the specific bit fieldindicating/related to the combination (or set) of CCs/BWPs.

For example, an operation of the UE (100/200 of FIGS. 16 to 20) in thestep S1330 to receive the MAC-CE from the BS (100/200 of FIGS. 16 to 20)may be implemented by the device of FIGS. 16 to 20 to be describedbelow. For example, referring to FIG. 17, one or more processors 102 maycontrol one or more transceivers 106 and/or one or more memories 104 soas to receive the MAC-CE, and the one or more transceivers 106 mayreceive the MAC-CE from the BS.

The UE may receive DCI/DL channel from the BS (i.e., perform DLreception) based on the RRC configuration information and/or the MAC-CE,in S1340. The DL channel may include PDCCH/PDSCH, etc. For example, theUE may receive the DCI/DL channel based on the above-described proposedmethods (e.g., the proposal 1/proposal 1-1/proposal 2/proposal 3, etc.).For example, the DCI may include information (e.g., transmissionconfiguration indication) for dynamically selecting one of multiple TCIstates. For example, the UE may receive the PDSCH based on thedynamically indicated TCI state via the DCI.

For example, an operation of the UE (100/200 of FIGS. 16 to 20) in thestep S1340 to perform the DL reception from the BS (100/200 of FIGS. 16to 20) may be implemented by the device of FIGS. 16 to 20 to bedescribed below. For example, referring to FIG. 17, one or moreprocessors 102 may control one or more transceivers 106 and/or one ormore memories 104 so as to perform the DL reception, and the one or moretransceivers 106 perform the DL reception for the BS.

BS Operation

A BS may receive UE capability information from a UE, in S1310. Forexample, the BS may receive, from the UE, the UE capability informationrelated to the above-described proposed methods (e.g., the proposal1/proposal 1-1/proposal 2/proposal 3, etc.). As an example, the UEcapability information may include information related to whether anMAC-CE for TCI state activation/deactivation is supported. As anexample, the UE capability information may include informationfor/related to the number of combinations of CCs/BWPs (or sets ofCCs/BWPs) that the UE can support. As an example, the MAC-CE maycorrespond to a (single) MAC-CE for activating the same set of PDSCH TCIstate IDs for multiple CCs/BWPs.

For example, an operation of the BS (100/200 of FIGS. 16 to 20) in thestep S1310 to receive the UE capability information from the UE (100/200of FIGS. 16 to 20) may be implemented by a device of FIGS. 16 to 20 tobe described below. For example, referring to FIG. 17, one or moreprocessors 202 may control one or more transceivers 206 and/or one ormore memories 204 so as to receive the UE capability information, andthe one or more transceivers 206 may receive the UE capabilityinformation from the UE.

The BS may transmit RRC configuration information to the UE, in S1320.The RRC configuration information may include configuration informationrelated to TCI state(s)/DL (e.g., PDSCH/PDCCH, etc.) transmissionrelated configuration information, etc. The RRC configurationinformation may include one or multiple configurations and may betransmitted via UE-specific RRC signaling. For example, the RRCconfiguration information may include RRC configuration, etc. describedin the above-described proposed methods (e.g., the proposal 1/proposal1-1/proposal 2/proposal 3, etc.). As an example, the RRC configurationinformation may include information related to candidate TCI states. Forexample, the candidate TCI states may be differently configured perCC/BWP. As an example, the RRC configuration information may includeinformation for/related to candidates of combination (or set) ofCCs/BWPs related to (simultaneous) TCI states Activation/Deactivation(e.g., list information for the combination (or set) of CCs/BWPs).

For example, an operation of the BS (100/200 of FIGS. 16 to 20) in thestep S1320 to transmit the RRC configuration information to the UE(100/200 of FIGS. 16 to 20) may be implemented by the device of FIGS. 16to 20 to be described below. For example, referring to FIG. 17, one ormore processors 202 may control one or more transceivers 206 and/or oneor more memories 204 so as to transmit the RRC configurationinformation, and the one or more transceivers 206 may transmit the RRCconfiguration information to the UE.

The BS may transmit an MAC-CE to the UE, in S1330. For example, theMAC-CE may include indication information, etc. described in theabove-described proposed methods (e.g., the proposal 1/proposal1-1/proposal 2/proposal 3, etc.). As an example, information forconcatenation of the multiple CCs/BWPs may be received via the MAC-CE.For example, TCI state activation may be simultaneously performed on themultiple CCs/BWPs to which the concatenation is applied. As an example,the MAC-CE may include information related to the TCI state activation.For example, the TCI state activation may vary per CC/BWP. For example,if simultaneous TCI states activation is performed for the multipleCCs/BWPs, the BS may operate considering an activated TCI state ID ineach CC/BWP. As an example, the MAC-CE may include a specific bit field(e.g., X=log₂n, where X is one of 1, 2, 3, 4, 5, 6, 7, and 8) indicatingany one combination (or set) of CCs/BWPs among candidates of combination(or set) of CCs/BWPs configured via the RRC configuration information.For example, the MAC-CE may additionally include informationrepresenting/indicating whether the MAC-CE is related to TCI statesupdate for a single CC/BWP or simultaneous TCI states update for themultiple CCs/BWPs, in addition to the specific bit fieldindicating/related to the combination (or set) of CCs/BWPs.

For example, an operation of the BS (100/200 of FIGS. 16 to 20) in thestep S1330 to transmit the MAC-CE to the UE (100/200 of FIGS. 16 to 20)may be implemented by the device of FIGS. 16 to 20 to be describedbelow. For example, referring to FIG. 17, one or more processors 202 maycontrol one or more transceivers 206 and/or one or more memories 204 soas to transmit the MAC-CE, and the one or more transceivers 206 maytransmit the MAC-CE to the UE.

The BS may transmit DCI/DL channel to the UE (i.e., perform DLtransmission) based on the RRC configuration information and/or theMAC-CE, in S1340. The DL channel may include PDCCH/PDSCH, etc. Forexample, the BS may transmit the DCI/DL channel based on theabove-described proposed methods (e.g., the proposal 1/proposal1-1/proposal 2/proposal 3, etc.). For example, the DCI may includeinformation (e.g., transmission configuration indication) fordynamically selecting one of multiple TCI states. For example, thedynamically indicated TCI state may be applied to the PDSCH transmittedby the BS based on the DCI.

For example, an operation of the BS (100/200 of FIGS. 16 to 20) in thestep S1340 to perform the DL transmission to the UE (100/200 of FIGS. 16to 20) may be implemented by the device of FIGS. 16 to 20 to bedescribed below. For example, referring to FIG. 17, one or moreprocessors 202 may control one or more transceivers 206 and/or one ormore memories 204 so as to perform the DL transmission, and the one ormore transceivers 106 perform the DL transmission for the UE.

As mentioned above, the above-described BS/UE signaling and operation(e.g., the proposal 1/proposal 1-1/proposal 2/proposal 3/FIG. 13, etc.)may be implemented by a device to be described below (e.g., X1 to X9).For example, the UE may correspond to a first wireless device, and theBS may correspond to a second wireless device. In some cases, thereverse may also be considered.

For example, the above-described BS/UE signaling and operation (e.g.,the proposal 1/proposal 1-1/proposal 2/proposal 3/FIG. 13, etc.) may beprocessed by one or more processors (e.g., 102 and 202) of FIGS. 16 to20. The above-described BS/UE signaling and operation (e.g., theproposal 1/proposal 1-1/proposal 2/proposal 3/FIG. 13, etc.) may bestored in a memory (e.g., one or more memories 104 and 204 of FIG. 17)in the form of a command/program (e.g., instruction, executable code)for running at least one processor (e.g., 102 and 202) of FIGS. 16 to20.

Effects according to embodiments of the present disclosure aresummarized as follows. When a single beam (or single TCI stateinformation) is commonly utilized for multiple configured CCs/BWPs(e.g., one beam system), repeated transmission of the control signal canbe prevented. Further, since TCI states can be simultaneously activatedon CCs/BWPs, the system can be operated more efficiently.

The embodiments described above are described from a UE operationperspective in detail below with reference to FIG. 14. Methods to bedescribed below are distinguished merely for convenience of description.Therefore, it is obvious that partial configuration of any one methodcan be replaced by partial configuration of another method, or methodscan be combined and applied.

FIG. 14 is a flow chart illustrating a method of receiving, by a UE, aphysical downlink shared channel in a wireless communication systemaccording to an embodiment of the present disclosure.

Referring to FIG. 14, a method of receiving, by a UE, a physicaldownlink shared channel in a wireless communication system according toan embodiment of the present disclosure comprises a step S1410 ofreceiving PDSCH configuration information, a step S1420 of receiving amessage representing activation of a TCI state, a step S1430 ofreceiving DCI scheduling the PDSCH, and a step S1440 of receiving thePDSCH.

In the step S1410, the UE receives, from a base station, configurationinformation related to a physical downlink shared channel (PDSCH).

According to the step S1410, an operation of the UE (100/200 of FIGS. 16to 20) to receive the configuration information related to the PDSCHfrom the base station (100/200 of FIGS. 16 to 20) may be implemented bya device of FIGS. 16 to 20. For example, referring to FIG. 17, one ormore processors 102 may control one or more transceivers 106 and/or oneor more memories 104 so as to receive the configuration informationrelated to the PDSCH from the base station 200.

In the step S1420, the UE receives, from the base station, a messagerepresenting activation of a transmission configuration indicator (TCI)state related to the PDSCH.

According to an embodiment, specific frequency domains related to theactivation may be determined based on the message. The TCI statesactivated by the message may be related to the specific frequencydomains. The present embodiment may be based on the proposal 1.

The specific frequency domains may be based on at least one of componentcarriers (CCs) or bandwidth parts (BWPs).

The specific frequency domains may be based on a list which ispre-configured via higher layer signaling. The pre-configured list maybe based on a list including M CCs/BWPs in the proposal 1.

According to an embodiment, the message may be based on a medium accesscontrol-control element (MAC CE).

According to an embodiment, the pre-configured list may be based on oneof a plurality of candidate lists. The present embodiment may be basedon the proposal 1-1. The plurality of candidate lists may be based on ncandidate CCs/BWPs in the proposal 1-1.

According to an embodiment, the message may represent specific TCIstates, and the activated TCI states may be based on the specific TCIstates and may be related to all or some of the specific frequencydomains. The present embodiment may be based on the proposal 2.

Based on TCI states configured in the specific frequency domains fullyoverlapping the specific TCI states, respectively, the specific TCIstates may be activated for the specific frequency domains.

Based on TCI states configured in one frequency domain of the specificfrequency domains partially overlapping the specific TCI states, thespecific TCI states may be activated for a frequency domain related to atransmission of the message among the specific frequency domains.

The above-described embodiments assume a case in which CC1, CC2 and CC3are configured to the UE and the TCI state is configured to each CC asfollows, as in the proposal 2, and the case is described in detailbelow.

For CC1, 100 TCI states are configured (TCI-state ID #1 to TCI-state ID#100),

For CC2, 50 TCI states are configured (TCI-state ID #1 to TCI-state ID#50),

For CC3, 100 TCI states are configured (TCI-state ID #1 to TCI-state ID#100)

If the message is transmitted via CC1 and the specific TCI states arebased on TCI state IDs (#1, 2, 4, 5, 21, 22, 24, 25), TCI states (#1 to#100, #1 to #50, #1 to #100) configured in the specific frequencydomains CC1, CC2 and CC3 fully overlap the specific TCI states (#1, 2,4, 5, 21, 22, 24, 25), respectively. Hence, the specific TCI states (#1,2, 4, 5, 21, 22, 24, 25) can be activated for the specific frequencydomains CC1, CC2 and CC3.

If the message is transmitted via CC1 and the specific TCI states arebased on TCI state IDs (#1, 2, 4, 5, 51, 52, 54, 55), the TCI states (#1to #50) configured in one frequency domain CC2 of the specific frequencydomains CC1, CC2 and CC3 partially overlap the specific TCI states (#1,2, 4, 5, 51, 52, 54, 55). Hence, the specific TCI states (#1, 2, 4, 5,51, 52, 54, 55) can be activated for the frequency domain CC1 related tothe transmission of the message among the specific frequency domainsCC1, CC2 and CC3. In this case, this is the same as the operationaccording to the existing method.

According to an embodiment, the message represents specific TCI states,and the activated TCI states may be based on all or some of the specificTCI states. The present embodiment may be based on the proposal 3.

For a frequency domain configured with TCI states including all thespecific TCI states among the specific frequency domains, all thespecific TCI states may be activated.

For a frequency domain configured with TCI states including some of thespecific TCI states among the specific frequency domains, some of thespecific TCI states may be activated.

The above-described embodiments assume a case in which CC1, CC2 and CC3are configured to the UE and the TCI state is configured to each CC asfollows, and the case is described in detail below.

For CC1, 100 TCI states are configured (TCI-state ID #1 to TCI-state ID#100),

For CC2, 50 TCI states are configured (TCI-state ID #1 to TCI-state ID#50),

For CC3, 100 TCI states are configured (TCI-state ID #1 to TCI-state ID#100)

It may be assumed that the message is transmitted via CC1 and thespecific TCI states are based on TCI state IDs (#1, 2, 4, 5, 51, 52, 54,55).

For the frequency domains CC1 and CC3 configured with TCI states (#1 to100 and #1 to 100) including all (#1, 2, 4, 5, 51, 52, 54, 55) thespecific TCI states among the specific frequency domains CC1, CC2 andCC3, all the specific TCI states may be activated.

For the frequency domain CC2 configured with TCI states (#1 to 50)including some (#1, 2, 4, 5) of the specific TCI states among thespecific frequency domains CC1, CC2 and CC3, some of the specific TCIstates may be activated.

According to an embodiment, if the activated TCI states are based onsome of the specific TCI states, some of the specific TCI states may bemapped to a plurality of states related to a transmission configurationindication field of the DCI based on a pre-configured pattern. Thepresent embodiment may be based on the proposal 3.

The pre-configured pattern may be a pattern in which some of thespecific TCI states are repeated in a specific order based on the TCIstate ID.

According to the step S1420, an operation of the UE (100/200 of FIGS. 16to 20) to receive the message representing the activation of the TCIstate related to the PDSCH from the base station (100/200 of FIGS. 16 to20) may be implemented by the device of FIGS. 16 to 20. For example,referring to FIG. 17, one or more processors 102 may control one or moretransceivers 106 and/or one or more memories 104 so as to receive themessage representing the activation of the TCI state related to thePDSCH from the base station 200.

In the step S1430, the UE receives, from the base station, downlinkcontrol information (DCI) scheduling the PDSCH. The DCI represents oneTCI state of the TCI states activated by the message.

According to the step S1430, an operation of the UE (100/200 of FIGS. 16to 20) to receive the DCI scheduling the PDSCH from the base station(100/200 of FIGS. 16 to 20) may be implemented by the device of FIGS. 16to 20. For example, referring to FIG. 17, one or more processors 102 maycontrol one or more transceivers 106 and/or one or more memories 104 soas to receive the DCI scheduling the PDSCH from the base station 200.

In the step S1440, the UE receives the PDSCH from the base station basedon the DCI.

According to the step S1440, an operation of the UE (100/200 of FIGS. 16to 20) to receive the PDSCH from the base station (100/200 of FIGS. 16to 20) based on the DCI may be implemented by the device of FIGS. 16 to20. For example, referring to FIG. 17, one or more processors 102 maycontrol one or more transceivers 106 and/or one or more memories 104 soas to receive the PDSCH from the base station 200 based on the DCI.

The embodiments described above are described from a BS operationperspective in detail below with reference to FIG. 15. Methods to bedescribed below are distinguished merely for convenience of description.Therefore, it is obvious that partial configuration of any one methodcan be replaced by partial configuration of another method, or methodscan be combined and applied.

FIG. 15 is a flow chart illustrating a method of transmitting, by a basestation, a physical downlink shared channel in a wireless communicationsystem according to another embodiment of the present disclosure.

Referring to FIG. 15, a method of transmitting, by a base station, aphysical downlink shared channel in a wireless communication systemaccording to an embodiment of the present disclosure comprises a stepS1510 of transmitting PDSCH configuration information, a step S1520 oftransmitting a message representing activation of a TCI state, a stepS1530 of transmitting DCI scheduling the PDSCH, and a step S1540 oftransmitting the PDSCH.

In the step S1510, the base station transmits, to a UE, configurationinformation related to a physical downlink shared channel (PDSCH).

According to the step S1510, an operation of the base station (100/200of FIGS. 16 to 20) to transmit the configuration information related tothe PDSCH to the UE (100/200 of FIGS. 16 to 20) may be implemented by adevice of FIGS. 16 to 20. For example, referring to FIG. 17, one or moreprocessors 202 may control one or more transceivers 206 and/or one ormore memories 204 so as to transmit the configuration informationrelated to the PDSCH to the UE 100.

In the step S1520, the base station transmits, to the UE, a messagerepresenting activation of a transmission configuration indicator (TCI)state related to the PDSCH.

According to an embodiment, specific frequency domains related to theactivation may be determined based on the message. The TCI statesactivated by the message may be related to the specific frequencydomains. The present embodiment may be based on the proposal 1.

The specific frequency domains may be based on at least one of componentcarriers (CCs) or bandwidth parts (BWPs).

The specific frequency domains may be based on a list which ispre-configured via higher layer signaling. The pre-configured list maybe based on a list including M CCs/BWPs in the proposal 1.

According to an embodiment, the message may be based on a medium accesscontrol-control element (MAC CE).

According to an embodiment, the pre-configured list may be based on oneof a plurality of candidate lists. The present embodiment may be basedon the proposal 1-1. The plurality of candidate lists may be based on ncandidate CCs/BWPs in the proposal 1-1.

According to an embodiment, the message may represent specific TCIstates, and the activated TCI states may be based on the specific TCIstates and may be related to all or some of the specific frequencydomains. The present embodiment may be based on the proposal 2.

Based on TCI states configured in the specific frequency domains fullyoverlapping the specific TCI states, respectively, the specific TCIstates may be activated for the specific frequency domains.

Based on TCI states configured in one frequency domain of the specificfrequency domains partially overlapping the specific TCI states, thespecific TCI states may be activated for a frequency domain related to atransmission of the message among the specific frequency domains.

The above-described embodiments assume a case in which CC1, CC2 and CC3are configured to the UE and the TCI state is configured to each CC asfollows, as in the proposal 2, and the case is described in detailbelow.

For CC1, 100 TCI states are configured (TCI-state ID #1 to TCI-state ID#100),

For CC2, 50 TCI states are configured (TCI-state ID #1 to TCI-state ID#50),

For CC3, 100 TCI states are configured (TCI-state ID #1 to TCI-state ID#100)

If the message is transmitted via CC1 and the specific TCI states arebased on TCI state IDs (#1, 2, 4, 5, 21, 22, 24, 25), TCI states (#1 to#100, #1 to #50, #1 to #100) configured in the specific frequencydomains CC1, CC2 and CC3 fully overlap the specific TCI states (#1, 2,4, 5, 21, 22, 24, 25), respectively. Hence, the specific TCI states (#1,2, 4, 5, 21, 22, 24, 25) can be activated for the specific frequencydomains CC1, CC2 and CC3.

If the message is transmitted via CC1 and the specific TCI states arebased on TCI state IDs (#1, 2, 4, 5, 51, 52, 54, 55), the TCI states (#1to #50) configured in one frequency domain CC2 of the specific frequencydomains CC1, CC2 and CC3 partially overlap the specific TCI states (#1,2, 4, 5, 51, 52, 54, 55). Hence, the specific TCI states (#1, 2, 4, 5,51, 52, 54, 55) can be activated for the frequency domain CC1 related tothe transmission of the message among the specific frequency domainsCC1, CC2 and CC3. In this case, this is the same as the operationaccording to the existing method.

According to an embodiment, the message represents specific TCI states,and the activated TCI states may be based on all or some of the specificTCI states. The present embodiment may be based on the proposal 3.

For a frequency domain configured with TCI states including all thespecific TCI states among the specific frequency domains, all thespecific TCI states may be activated.

For a frequency domain configured with TCI states including some of thespecific TCI states among the specific frequency domains, some of thespecific TCI states may be activated.

The above-described embodiments assume a case in which CC1, CC2 and CC3are configured to the UE and the TCI state is configured to each CC asfollows, and the case is described in detail below.

For CC1, 100 TCI states are configured (TCI-state ID #1 TCI-state ID#100),

For CC2, 50 TCI states are configured (TCI-state ID #1 TCI-state ID#50),

For CC3, 100 TCI states are configured (TCI-state ID #1 TCI-state ID#100)

It may be assumed that the message is transmitted via CC1 and thespecific TCI states are based on TCI state IDs (#1, 2, 4, 5, 51, 52, 54,55).

For the frequency domains CC1 and CC3 configured with TCI states (#1 to100 and #1 to 100) including all (#1, 2, 4, 5, 51, 52, 54, 55) thespecific TCI states among the specific frequency domains CC1, CC2 andCC3, all the specific TCI states may be activated.

For the frequency domain CC2 configured with TCI states (#1 to 50)including some (#1, 2, 4, 5) of the specific TCI states among thespecific frequency domains CC1, CC2 and CC3, some of the specific TCIstates may be activated.

According to an embodiment, if the activated TCI states are based onsome of the specific TCI states, some of the specific TCI states may bemapped to a plurality of states related to a transmission configurationindication field of the DCI based on a pre-configured pattern. Thepresent embodiment may be based on the proposal 3.

The pre-configured pattern may be a pattern in which some of thespecific TCI states are repeated in a specific order based on the TCIstate ID.

According to the step S1520, an operation of the base station (100/200of FIGS. 16 to 20) to transmit the message representing the activationof the TCI state related to the PDSCH to the UE (100/200 of FIGS. 16 to20) may be implemented by the device of FIGS. 16 to 20. For example,referring to FIG. 17, one or more processors 202 may control one or moretransceivers 206 and/or one or more memories 204 so as to transmit themessage representing the activation of the TCI state related to thePDSCH to the UE 100.

In the step S1530, the base station transmits, to the UE, downlinkcontrol information (DCI) scheduling the PDSCH. The DCI represents oneTCI state of the TCI states activated by the message.

According to the step S1530, an operation of the base station (100/200of FIGS. 16 to 20) to transmit the DCI scheduling the PDSCH to the UE(100/200 of FIGS. 16 to 20) may be implemented by the device of FIGS. 16to 20. For example, referring to FIG. 17, one or more processors 202 maycontrol one or more transceivers 206 and/or one or more memories 204 soas to transmit the DCI scheduling the PDSCH to the UE 100.

In the step S1540, the base station transmits the PDSCH to the UE basedon the DCI.

According to the step S1540, an operation of the base station (100/200of FIGS. 16 to 20) to transmit the PDSCH to the UE (100/200 of FIGS. 16to 20) based on the DCI may be implemented by the device of FIGS. 16 to20. For example, referring to FIG. 17, one or more processors 202 maycontrol one or more transceivers 206 and/or one or more memories 204 soas to transmit the PDSCH to the UE 100 based on the DCI.

Example of Communication System Applied to Present Disclosure

The various descriptions, functions, procedures, proposals, methods,and/or operational flowcharts of the present disclosure described inthis document may be applied to, without being limited to, a variety offields requiring wireless communication/connection (e.g., 5G) betweendevices.

Hereinafter, a description will be given in more detail with referenceto the drawings. In the following drawings/description, the samereference symbols may denote the same or corresponding hardware blocks,software blocks, or functional blocks unless described otherwise.

FIG. 16 illustrates a communication system 1 applied to the presentdisclosure.

Referring to FIG. 16, a communication system 1 applied to the presentdisclosure includes wireless devices, Base Stations (BSs), and anetwork. Herein, the wireless devices represent devices performingcommunication using Radio Access Technology (RAT) (e.g., 5G New RAT(NR)) or Long-Term Evolution (LTE)) and may be referred to ascommunication/radio/5G devices. The wireless devices may include,without being limited to, a robot 100 a, vehicles 100 b-1 and 100 b-2,an eXtended Reality (XR) device 100 c, a hand-held device 100 d, a homeappliance 100 e, an Internet of Things (IoT) device 100 f, and anArtificial Intelligence (AI) device/server 400. For example, thevehicles may include a vehicle having a wireless communication function,an autonomous driving vehicle, and a vehicle capable of performingcommunication between vehicles. Herein, the vehicles may include anUnmanned Aerial Vehicle (UAV) (e.g., a drone). The XR device may includean Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) deviceand may be implemented in the form of a Head-Mounted Device (HMD), aHead-Up Display (HUD) mounted in a vehicle, a television, a smartphone,a computer, a wearable device, a home appliance device, a digitalsignage, a vehicle, a robot, etc. The hand-held device may include asmartphone, a smartpad, a wearable device (e.g., a smartwatch or asmartglasses), and a computer (e.g., a notebook). The home appliance mayinclude a TV, a refrigerator, and a washing machine. The IoT device mayinclude a sensor and a smartmeter. For example, the BSs and the networkmay be implemented as wireless devices and a specific wireless device200 a may operate as a BS/network node with respect to other wirelessdevices.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. Relay, Integrated AccessBackhaul (IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

Example of Wireless Device Applied to the Present Disclosure

FIG. 17 illustrates wireless devices applicable to the presentdisclosure.

Referring to FIG. 17, a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100 x} of FIG. 16.

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherdevices. The one or more transceivers 106 and 206 may receive user data,control information, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother devices. For example, the one or more transceivers 106 and 206 maybe connected to the one or more processors 102 and 202 and transmit andreceive radio signals. For example, the one or more processors 102 and202 may perform control so that the one or more transceivers 106 and 206may transmit user data, control information, or radio signals to one ormore other devices. The one or more processors 102 and 202 may performcontrol so that the one or more transceivers 106 and 206 may receiveuser data, control information, or radio signals from one or more otherdevices. The one or more transceivers 106 and 206 may be connected tothe one or more antennas 108 and 208 and the one or more transceivers106 and 206 may be configured to transmit and receive user data, controlinformation, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, through the one ormore antennas 108 and 208. In this document, the one or more antennasmay be a plurality of physical antennas or a plurality of logicalantennas (e.g., antenna ports). The one or more transceivers 106 and 206may convert received radio signals/channels etc. From RF band signalsinto baseband signals in order to process received user data, controlinformation, radio signals/channels, etc. using the one or moreprocessors 102 and 202. The one or more transceivers 106 and 206 mayconvert the user data, control information, radio signals/channels, etc.Processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals. To this end, the one or moretransceivers 106 and 206 may include (analog) oscillators and/orfilters.

Example of Signal Processing Circuit Applied to the Present Disclosure

FIG. 18 illustrates a signal process circuit for a transmission signal.

Referring to FIG. 18, a signal processing circuit 1000 may includescramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040,resource mappers 1050, and signal generators 1060. An operation/functionof FIG. 18 may be performed, without being limited to, the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 17. Hardwareelements of FIG. 18 may be implemented by the processors 102 and 202and/or the transceivers 106 and 206 of FIG. 17. For example, blocks 1010to 1060 may be implemented by the processors 102 and 202 of FIG. 17.Alternatively, the blocks 1010 to 1050 may be implemented by theprocessors 102 and 202 of FIG. 17 and the block 1060 may be implementedby the transceivers 106 and 206 of FIG. 17.

Codewords may be converted into radio signals via the signal processingcircuit 1000 of FIG. 18. Herein, the codewords are encoded bit sequencesof information blocks. The information blocks may include transportblocks (e.g., a UL-SCH transport block, a DL-SCH transport block). Theradio signals may be transmitted through various physical channels(e.g., a PUSCH and a PDSCH).

Specifically, the codewords may be converted into scrambled bitsequences by the scramblers 1010. Scramble sequences used for scramblingmay be generated based on an initialization value, and theinitialization value may include ID information of a wireless device.The scrambled bit sequences may be modulated to modulation symbolsequences by the modulators 1020. A modulation scheme may includepi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying(m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complexmodulation symbol sequences may be mapped to one or more transportlayers by the layer mapper 1030. Modulation symbols of each transportlayer may be mapped (precoded) to corresponding antenna port(s) by theprecoder 1040. Outputs z of the precoder 1040 may be obtained bymultiplying outputs y of the layer mapper 1030 by an N*M precodingmatrix W. Herein, N is the number of antenna ports and M is the numberof transport layers. The precoder 1040 may perform precoding afterperforming transform precoding (e.g., DFT) for complex modulationsymbols. Alternatively, the precoder 1040 may perform precoding withoutperforming transform precoding.

The resource mappers 1050 may map modulation symbols of each antennaport to time-frequency resources. The time-frequency resources mayinclude a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMAsymbols) in the time domain and a plurality of subcarriers in thefrequency domain. The signal generators 1060 may generate radio signalsfrom the mapped modulation symbols and the generated radio signals maybe transmitted to other devices through each antenna. For this purpose,the signal generators 1060 may include Inverse Fast Fourier Transform(IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-AnalogConverters (DACs), and frequency up-converters.

Signal processing procedures for a signal received in the wirelessdevice may be configured in a reverse manner of the signal processingprocedures 1010 to 1060 of FIG. 18. For example, the wireless devices(e.g., 100 and 200 of FIG. 17) may receive radio signals from theexterior through the antenna ports/transceivers. The received radiosignals may be converted into baseband signals through signal restorers.To this end, the signal restorers may include frequency downlinkconverters, Analog-to-Digital Converters (ADCs), CP remover, and FastFourier Transform (FFT) modules. Next, the baseband signals may berestored to codewords through a resource demapping procedure, apostcoding procedure, a demodulation processor, and a descramblingprocedure. The codewords may be restored to original information blocksthrough decoding. Therefore, a signal processing circuit (notillustrated) for a reception signal may include signal restorers,resource demappers, a postcoder, demodulators, descramblers, anddecoders.

Example of Application of Wireless Device Applied to the PresentDisclosure

FIG. 19 illustrates another example of a wireless device applied to thepresent disclosure.

The wireless device may be implemented in various forms according to ause-case/service (refer to FIG. 16). Referring to FIG. 19, wirelessdevices 100 and 200 may correspond to the wireless devices 100 and 200of FIG. 17 and may be configured by various elements, components,units/portions, and/or modules. For example, each of the wirelessdevices 100 and 200 may include a communication unit 110, a control unit120, a memory unit 130, and additional components 140. The communicationunit may include a communication circuit 112 and transceiver(s) 114. Forexample, the communication circuit 112 may include the one or moreprocessors 102 and 202 and/or the one or more memories 104 and 204 ofFIG. 17. For example, the transceiver(s) 114 may include the one or moretransceivers 106 and 206 and/or the one or more antennas 108 and 208 ofFIG. 17. The control unit 120 is electrically connected to thecommunication unit 110, the memory 130, and the additional components140 and controls overall operation of the wireless devices. For example,the control unit 120 may control an electric/mechanical operation of thewireless device based on programs/code/commands/information stored inthe memory unit 130. The control unit 120 may transmit the informationstored in the memory unit 130 to the exterior (e.g., other communicationdevices) via the communication unit 110 through a wireless/wiredinterface or store, in the memory unit 130, information received throughthe wireless/wired interface from the exterior (e.g., othercommunication devices) via the communication unit 110.

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (100 aof FIG. 16), the vehicles (100 b-1 and 100 b-2 of FIG. 16), the XRdevice (100 c of FIG. 16), the hand-held device (100 d of FIG. 16), thehome appliance (100 e of FIG. 16), the IoT device (100 f of FIG. 16), adigital broadcast terminal, a hologram device, a public safety device,an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 16), the BSs (200 of FIG. 16), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 19, the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 200 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 200, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 200 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

Example of Hand-Held Device Applied to the Present Disclosure

FIG. 20 illustrates a hand-held device applied to the presentdisclosure. The hand-held device may include a smartphone, a smartpad, awearable device (e.g., a smartwatch or a smartglasses), or a portablecomputer (e.g., a notebook). The hand-held device may be referred to asa mobile station (MS), a user terminal (UT), a Mobile Subscriber Station(MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or aWireless Terminal (WT).

Referring to FIG. 20, a hand-held device 100 may include an antenna unit108, a communication unit 110, a control unit 120, a memory unit 130, apower supply unit 140 a, an interface unit 140 b, and an I/O unit 140 c.The antenna unit 108 may be configured as a part of the communicationunit 110. Blocks 110 to 130/140 a to 140 c correspond to the blocks 110to 130/140 of FIG. 19, respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from other wireless devices or BSs. Thecontrol unit 120 may perform various operations by controllingconstituent elements of the hand-held device 100. The control unit 120may include an Application Processor (AP). The memory unit 130 may storedata/parameters/programs/code/commands needed to drive the hand-helddevice 100. The memory unit 130 may store input/output data/information.The power supply unit 140 a may supply power to the hand-held device 100and include a wired/wireless charging circuit, a battery, etc. Theinterface unit 140 b may support connection of the hand-held device 100to other external devices. The interface unit 140 b may include variousports (e.g., an audio I/O port and a video I/O port) for connection withexternal devices. The I/O unit 140 c may input or output videoinformation/signals, audio information/signals, data, and/or informationinput by a user. The I/O unit 140 c may include a camera, a microphone,a user input unit, a display unit 140 d, a speaker, and/or a hapticmodule.

As an example, in the case of data communication, the I/O unit 140 c mayacquire information/signals (e.g., touch, text, voice, images, or video)input by a user and the acquired information/signals may be stored inthe memory unit 130. The communication unit 110 may convert theinformation/signals stored in the memory into radio signals and transmitthe converted radio signals to other wireless devices directly or to aBS. The communication unit 110 may receive radio signals from otherwireless devices or the BS and then restore the received radio signalsinto original information/signals. The restored information/signals maybe stored in the memory unit 130 and may be output as various types(e.g., text, voice, images, video, or haptic) through the I/O unit 140c.

Effects of a method of transmitting and receiving a physical downlinkshared channel and a device therefor in a wireless communication systemaccording to embodiments of the present disclosure are described asfollows.

According to embodiments of the present disclosure, TCI states can beactivated for specific frequency domains based on a list which ispre-configured via higher layer signaling.

Accordingly, since the activation of the TCI states can be equallyapplied to the frequency domains based on the pre-configured list, anoverhead of control signaling related to the activation of the TCIstates can be reduced. Further, a beam can be updated more efficientlythan when a common beam is used for a plurality of frequency domains.

As described above, according to embodiments of the present disclosure,latency and overhead related to a transmission/reception procedure ofthe PDSCH can be reduced.

Here, wireless communication technology implemented in wireless devices100 and 200 of FIG. 17 of the present disclosure may include NarrowbandInternet of Things for low-power communication in addition to LTE, NR,and 6G. In this case, for example, NB-IoT technology may be an exampleof Low Power Wide Area Network (LPWAN) technology and may be implementedas standards such as LTE Cat NB1, and/or LTE Cat NB2, and is not limitedto the name described above. Additionally or alternatively, the wirelesscommunication technology implemented in the wireless devices 100 and 200of FIG. 17 of the present disclosure may perform communication based onLTE-M technology. In this case, as an example, the LTE-M technology maybe an example of the LPWAN and may be called various names includingenhanced Machine Type Communication (eMTC), and the like. For example,the LTE-M technology may be implemented as at least any one of variousstandards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTEnon-Bandwidth Limited (non-BL), 5) LTE-MTC, 6) LTE Machine TypeCommunication, and/or 7) LTE M. Additionally or alternatively, thewireless communication technology implemented in the wireless devices100 and 200 of FIG. 17 of the present disclosure may includes at leastone of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN)considering the low-power communication, and is not limited to the namedescribed above. As an example, the ZigBee technology may generatepersonal area networks (PAN) associated with small/low-power digitalcommunication based on various standards including IEEE 802.15.4, andthe like, and may be called various names.

The embodiments of the present disclosure described above arecombinations of elements and features of the present disclosure. Theelements or features may be considered selective unless otherwisementioned. Each element or feature may be practiced without beingcombined with other elements or features. Further, an embodiment of thepresent disclosure may be constructed by combining parts of the elementsand/or features. Operation orders described in embodiments of thepresent disclosure may be rearranged. Some constructions of any oneembodiment may be included in another embodiment and may be replacedwith corresponding constructions of another embodiment. It is obvious tothose skilled in the art that claims that are not explicitly cited ineach other in the appended claims may be presented in combination as anembodiment of the present disclosure or included as a new claim bysubsequent amendment after the application is filed.

The embodiments of the present disclosure may be achieved by variousmeans, for example, hardware, firmware, software, or a combinationthereof. In a hardware configuration, the methods according to theembodiments of the present disclosure may be achieved by one or moreApplication Specific Integrated Circuits (ASICs), Digital SignalProcessors (DSPs), Digital Signal Processing Devices (DSPDs),Programmable Logic Devices (PLDs), Field Programmable Gate Arrays(FPGAs), processors, controllers, microcontrollers, microprocessors,etc.

In a firmware or software configuration, the embodiments of the presentdisclosure may be implemented in the form of a module, a procedure, afunction, etc. For example, software code may be stored in a memory unitand executed by a processor. The memories may be located at the interioror exterior of the processors and may transmit data to and receive datafrom the processors via various known means.

Those skilled in the art will appreciate that the present disclosure maybe carried out in other specific ways than those set forth hereinwithout departing from the spirit and essential characteristics of thepresent disclosure. The above embodiments are therefore to be construedin all aspects as illustrative and not restrictive. The scope of thedisclosure should be determined by the appended claims and their legalequivalents, not by the above description, and all changes coming withinthe meaning and equivalency range of the appended claims are intended tobe embraced therein.

What is claimed is:
 1. A method of receiving, by a user equipment (UE),a physical downlink shared channel (PDSCH) in a wireless communicationsystem, the method comprising: receiving configuration informationrelated to the PDSCH, wherein Transmission Configuration Indicatorstates (TCI states) related to the PDSCH are configured based on theconfiguration information; receiving a message representing anactivation of the TCI states based on the configuration information,wherein a specific component carrier (CC) related to the activation isindicated based on the message; receiving downlink control information(DCI) scheduling the PDSCH; and receiving the PDSCH based on the DCI,wherein, based on the message, specific TCI states among the TCI statesbased on the configuration information are activated for the specificCC, wherein, based on the DCI, one of the specific TCI states isindicated, wherein, based on that specific frequency domains related tothe activation of the TCI states based on the configuration aredetermined based on the message: the specific TCI states are activatedfor the specific frequency domains, the specific frequency domains arebased on at least one of a plurality of CCs or a plurality of bandwidthparts (BWPs), and the specific frequency domains are determined based ona list which is pre-configured via a higher layer signaling.
 2. Themethod of claim 1, wherein the message is based on a medium accesscontrol-control element (MAC CE).
 3. The method of claim 1, wherein thepre-configured list is based on one of a plurality of candidate lists.4. The method of claim 2, wherein the specific TCI states are related toall or some of the specific frequency domains.
 5. The method of claim 4,wherein based on TCI states configured in the specific frequency domainsfully overlapping the specific TCI states, respectively, the specificTCI states are activated for the specific frequency domains.
 6. Themethod of claim 4, wherein based on TCI states configured in onefrequency domain of the specific frequency domains partially overlappingthe specific TCI states, the specific TCI states are activated for afrequency domain related to a transmission of the message among thespecific frequency domains.
 7. The method of claim 2, wherein thespecific TCI states are based on all or some of the TCI states indicatedby the message.
 8. The method of claim 7, wherein, for a frequencydomain configured with TCI states including all of the TCI statesindicated by the message among the specific frequency domains, all ofthe TCI states indicated by the message are activated.
 9. The method ofclaim 7, wherein, for a frequency domain configured with TCI statesincluding some of the TCI states indicated by the message among thespecific frequency domains, some of the TCI states indicated by themessage are activated.
 10. The method of claim 9, wherein based on thespecific TCI states being based on some of the TCI states indicated bythe message, some of the TCI states indicated by the message are mappedto a plurality of states related to a transmission configurationindication field of the DCI based on a pre-configured pattern.
 11. Themethod of claim 10, wherein the pre-configured pattern is a pattern inwhich some of the TCI states indicated by the message are repeated in aspecific order based on a TCI state ID.
 12. A user equipment (UE)receiving a physical downlink shared channel (PDSCH) in a wirelesscommunication system, the UE comprising: one or more transceivers; oneor more processors configured to control the one or more transceivers;and one or more memories operably connected to the one or moreprocessors, wherein the one or more memories store instructions, basedon being executed by the one or more processors, performing operations,wherein the operations comprise: receiving configuration informationrelated to the PDSCH, wherein Transmission Configuration Indicatorstates (TCI states) related to the PDSCH are configured based on theconfiguration information; receiving a message representing anactivation of the TCI states based on the configuration informationbased on the configuration information, wherein a specific componentcarrier (CC) related to the activation is indicated based on themessage; receiving downlink control information (DCI) scheduling thePDSCH; and receiving the PDSCH based on the DCI, wherein, based on themessage, specific TCI states among the TCI states based on theconfiguration information are activated for the specific CC, wherein,based on the DCI, one of the specific TCI states is indicated, wherein,based on that specific frequency domains related to the activation ofthe TCI states based on the configuration are determined based on themessage: the specific TCI states are activated for the specificfrequency domains, the specific frequency domains are based on at leastone of a plurality of CCs or a plurality of bandwidth parts (BWPs), andthe specific frequency domains are determined based on a list which ispre-configured via a higher layer signaling.
 13. A base stationtransmitting a physical downlink shared channel (PDSCH) in a wirelesscommunication system, the base station comprising: one or moretransceivers; one or more processors configured to control the one ormore transceivers; and one or more memories operably connected to theone or more processors, wherein the one or more memories storeinstructions, based on being executed by the one or more processors,performing operations, wherein the operations comprise: transmittingconfiguration information related to the PDSCH, wherein TransmissionConfiguration Indicator states (TCI states) related to the PDSCH areconfigured based on the configuration information; transmitting amessage representing an activation of the TCI states based on theconfiguration information, wherein a specific component carrier (CC)related to the activation is indicated based on the message;transmitting downlink control information (DCI) scheduling the PDSCH;and transmitting the PDSCH based on the DCI, wherein, based on themessage, specific TCI states among the TCI states based on theconfiguration information are activated for the specific CC, wherein,based on the DCI, one of the specific TCI states is indicated, wherein,based on that specific frequency domains related to the activation ofthe TCI states based on the configuration are determined based on themessage: the specific TCI states are activated for the specificfrequency domains, the specific frequency domains are based on at leastone of a plurality of CCs or a plurality of bandwidth parts (BWPs), andthe specific frequency domains are determined based on a list which ispre-configured via a higher layer signaling.